Add stdoutConfig and stderrConfig to alpha features table

`stdoutConfig` and `stderrCon` are alpha features but they are not
in the alpha features table. This change adds these two features in
the table so that users are aware and maintainers can track progress
through the stability levels.

/kind documentation

Author: jerop

docs/additional-configs.md

@@ -304,22 +304,23 @@ Alpha features in the following table are still in development and their syntax
 
 Features currently in "alpha" are:
 
-| Feature                                                                        | Proposal                                                                                                             | Release                                                              | Individual Flag                                  |
-|:-------------------------------------------------------------------------------|:---------------------------------------------------------------------------------------------------------------------|:---------------------------------------------------------------------|:-------------------------------------------------|
-| [Bundles ](./pipelineruns.md#tekton-bundles)                                   | [TEP-0005](https://github.com/tektoncd/community/blob/main/teps/0005-tekton-oci-bundles.md)                          | [v0.18.0](https://github.com/tektoncd/pipeline/releases/tag/v0.18.0) | `enable-tekton-oci-bundles`                      |
-| [Hermetic Execution Mode](./hermetic.md)                                       | [TEP-0025](https://github.com/tektoncd/community/blob/main/teps/0025-hermekton.md)                                   | [v0.25.0](https://github.com/tektoncd/pipeline/releases/tag/v0.25.0) |                                                  |
-| [Windows Scripts](./tasks.md#windows-scripts)                                  | [TEP-0057](https://github.com/tektoncd/community/blob/main/teps/0057-windows-support.md)                             | [v0.28.0](https://github.com/tektoncd/pipeline/releases/tag/v0.28.0) |                                                  |
-| [Debug](./debug.md)                                                            | [TEP-0042](https://github.com/tektoncd/community/blob/main/teps/0042-taskrun-breakpoint-on-failure.md)               | [v0.26.0](https://github.com/tektoncd/pipeline/releases/tag/v0.26.0) |                                                  |
-| [Step and Sidecar Overrides](./taskruns.md#overriding-task-steps-and-sidecars) | [TEP-0094](https://github.com/tektoncd/community/blob/main/teps/0094-specifying-resource-requirements-at-runtime.md) | [v0.34.0](https://github.com/tektoncd/pipeline/releases/tag/v0.34.0) |                                                  |
-| [Trusted Resources](./trusted-resources.md)                                    | [TEP-0091](https://github.com/tektoncd/community/blob/main/teps/0091-trusted-resources.md)                           | [v0.49.0](https://github.com/tektoncd/pipeline/releases/tag/v0.49.0) | `trusted-resources-verification-no-match-policy` |
-| [Larger Results via Sidecar Logs](#enabling-larger-results-using-sidecar-logs) | [TEP-0127](https://github.com/tektoncd/community/blob/main/teps/0127-larger-results-via-sidecar-logs.md)             | [v0.43.0](https://github.com/tektoncd/pipeline/releases/tag/v0.43.0) | `results-from`                                   |
-| [Configure Default Resolver](./resolution.md#configuring-built-in-resolvers)   | [TEP-0133](https://github.com/tektoncd/community/blob/main/teps/0133-configure-default-resolver.md)                  | [v0.46.0](https://github.com/tektoncd/pipeline/releases/tag/v0.46.0) |                                                  |
-| [Coschedule](./affinityassistants.md)                                          | [TEP-0135](https://github.com/tektoncd/community/blob/main/teps/0135-coscheduling-pipelinerun-pods.md)               | [v0.51.0](https://github.com/tektoncd/pipeline/releases/tag/v0.51.0) | `coschedule`                                     |
-| [keep pod on cancel](./taskruns.md#cancelling-a-taskrun)                       | N/A                                                                                                                  | [v0.52.0](https://github.com/tektoncd/pipeline/releases/tag/v0.52.0) | `keep-pod-on-cancel`                             |
-| [CEL in WhenExpression](./taskruns.md#cancelling-a-taskrun)                    | [TEP-0145](https://github.com/tektoncd/community/blob/main/teps/0145-cel-in-whenexpression.md)                       | [v0.53.0](https://github.com/tektoncd/pipeline/releases/tag/v0.53.0) | `enable-cel-in-whenexpression`                   |
-| [Param Enum](./taskruns.md#parameter-enums)                                    | [TEP-0144](https://github.com/tektoncd/community/blob/main/teps/0144-param-enum.md)                                  | [v0.54.0](https://github.com/tektoncd/pipeline/releases/tag/v0.54.0) | `enable-param-enum`                              |
-| [Reusable Steps via StepActions](./stepactions.md)                             | [TEP-0142](https://github.com/tektoncd/community/blob/main/teps/0142-enable-step-reusability.md)                     | [v0.54.0](https://github.com/tektoncd/pipeline/releases/tag/v0.54.0) | `enable-step-actions`                            |
-| [Ignore Task Failure](./pipelines.md#using-the-onerror-field)                             | [TEP-0050](https://github.com/tektoncd/community/blob/main/teps/0050-ignore-task-failures.md)                     | N/A |                            |
+| Feature                                                                                                      | Proposal                                                                                                             | Release                                                              | Individual Flag                                  |
+|:-------------------------------------------------------------------------------------------------------------|:---------------------------------------------------------------------------------------------------------------------|:---------------------------------------------------------------------|:-------------------------------------------------|
+| [Bundles ](./pipelineruns.md#tekton-bundles)                                                                 | [TEP-0005](https://github.com/tektoncd/community/blob/main/teps/0005-tekton-oci-bundles.md)                          | [v0.18.0](https://github.com/tektoncd/pipeline/releases/tag/v0.18.0) | `enable-tekton-oci-bundles`                      |
+| [Hermetic Execution Mode](./hermetic.md)                                                                     | [TEP-0025](https://github.com/tektoncd/community/blob/main/teps/0025-hermekton.md)                                   | [v0.25.0](https://github.com/tektoncd/pipeline/releases/tag/v0.25.0) |                                                  |
+| [Windows Scripts](./tasks.md#windows-scripts)                                                                | [TEP-0057](https://github.com/tektoncd/community/blob/main/teps/0057-windows-support.md)                             | [v0.28.0](https://github.com/tektoncd/pipeline/releases/tag/v0.28.0) |                                                  |
+| [Debug](./debug.md)                                                                                          | [TEP-0042](https://github.com/tektoncd/community/blob/main/teps/0042-taskrun-breakpoint-on-failure.md)               | [v0.26.0](https://github.com/tektoncd/pipeline/releases/tag/v0.26.0) |                                                  |
+| [Step and Sidecar Overrides](./taskruns.md#overriding-task-steps-and-sidecars)                               | [TEP-0094](https://github.com/tektoncd/community/blob/main/teps/0094-specifying-resource-requirements-at-runtime.md) | [v0.34.0](https://github.com/tektoncd/pipeline/releases/tag/v0.34.0) |                                                  |
+| [StdoutConfig and StderrConfig](./tasks#redirecting-step-output-streams-with-stdoutConfig-and-stderrConfig)) | [TEP-0011](https://github.com/tektoncd/community/blob/main/teps/0011-redirecting-step-output-streams.md)             | [v0.38.0](https://github.com/tektoncd/pipeline/releases/tag/v0.38.0) |                                                  |
+| [Trusted Resources](./trusted-resources.md)                                                                  | [TEP-0091](https://github.com/tektoncd/community/blob/main/teps/0091-trusted-resources.md)                           | [v0.49.0](https://github.com/tektoncd/pipeline/releases/tag/v0.49.0) | `trusted-resources-verification-no-match-policy` |
+| [Larger Results via Sidecar Logs](#enabling-larger-results-using-sidecar-logs)                               | [TEP-0127](https://github.com/tektoncd/community/blob/main/teps/0127-larger-results-via-sidecar-logs.md)             | [v0.43.0](https://github.com/tektoncd/pipeline/releases/tag/v0.43.0) | `results-from`                                   |
+| [Configure Default Resolver](./resolution.md#configuring-built-in-resolvers)                                 | [TEP-0133](https://github.com/tektoncd/community/blob/main/teps/0133-configure-default-resolver.md)                  | [v0.46.0](https://github.com/tektoncd/pipeline/releases/tag/v0.46.0) |                                                  |
+| [Coschedule](./affinityassistants.md)                                                                        | [TEP-0135](https://github.com/tektoncd/community/blob/main/teps/0135-coscheduling-pipelinerun-pods.md)               | [v0.51.0](https://github.com/tektoncd/pipeline/releases/tag/v0.51.0) | `coschedule`                                     |
+| [keep pod on cancel](./taskruns.md#cancelling-a-taskrun)                                                     | N/A                                                                                                                  | [v0.52.0](https://github.com/tektoncd/pipeline/releases/tag/v0.52.0) | `keep-pod-on-cancel`                             |
+| [CEL in WhenExpression](./taskruns.md#cancelling-a-taskrun)                                                  | [TEP-0145](https://github.com/tektoncd/community/blob/main/teps/0145-cel-in-whenexpression.md)                       | [v0.53.0](https://github.com/tektoncd/pipeline/releases/tag/v0.53.0) | `enable-cel-in-whenexpression`                   |
+| [Param Enum](./taskruns.md#parameter-enums)                                                                  | [TEP-0144](https://github.com/tektoncd/community/blob/main/teps/0144-param-enum.md)                                  | [v0.54.0](https://github.com/tektoncd/pipeline/releases/tag/v0.54.0) | `enable-param-enum`                              |
+| [Reusable Steps via StepActions](./stepactions.md)                                                           | [TEP-0142](https://github.com/tektoncd/community/blob/main/teps/0142-enable-step-reusability.md)                     | [v0.54.0](https://github.com/tektoncd/pipeline/releases/tag/v0.54.0) | `enable-step-actions`                            |
+| [Ignore Task Failure](./pipelines.md#using-the-onerror-field)                                                | [TEP-0050](https://github.com/tektoncd/community/blob/main/teps/0050-ignore-task-failures.md)                        | N/A                                                                  |                                                  |
 
 ### Beta Features