Fix grammar nit in README additions

Author: maru-ava

tests/e2e/README.md

@@ -15,7 +15,7 @@ See [`tests.e2e.sh`](../../scripts/tests.e2e.sh) for an example.
 
 ### Simplifying usage with direnv
 
-The repo includes an [.envrc](../../.envrc) that can be applied by
+The repo includes a [.envrc](../../.envrc) that can be applied by
 [direnv](https://direnv.net/) when in a shell. This will enable
 `ginkgo` to be invoked directly (without a `./bin/` prefix ) and
 without having to specify the `--avalanchego-path` or `--plugin-dir`

tests/fixture/tmpnet/README.md

@@ -68,7 +68,7 @@ network.
 
 ### Simplifying usage with direnv
 
-The repo includes an [.envrc](../../../.envrc) that can be applied by
+The repo includes a [.envrc](../../../.envrc) that can be applied by
 [direnv](https://direnv.net/) when in a shell. This will enable
 `tmpnetctl` to be invoked directly (without a `./bin/` prefix ) and
 without having to specify the `--avalanchego-path` or `--plugin-dir`