[CI] Improve Carvel docs

Author: Corneil du Plessis

spring-cloud-dataflow-docs/src/main/asciidoc/configuration-carvel.adoc

@@ -32,7 +32,7 @@ NOTE: Some of these utilities are not installed in macOS or *nix by default but
 
 These scripts assume you are connected to a Kubernetes cluster and `kubectl` is available.
 
-[cols="3m,3,6"]
+[cols="3m,3,6a"]
 |===
 |Name | Arguments |Descriptions
 
@@ -56,6 +56,17 @@ These scripts assume you are connected to a Kubernetes cluster and `kubectl` is
 | <host> <port> [step]
 | Configures Spring Boot Actuator properties for Data Flow, Skipper, Streams and Tasks. Default `step` is 10s
 
+| configure-database.sh
+| <app> <database> <url> <username/secret-name>  [password/secret-username-key] [secret-password-key]
+| If only _secret-name_ is provided then _secret-username-key_ defaults to `username` and _secret-password-key_ defaults to `password`.
+
+The following 3 combinations are allowed after the _url_:
+
+* <secret-name>
+* <secret-name> <username-key>
+<password-key>
+* <username> <password>
+
 | deploy-scdf.sh
 | [app-name]
 | Deploys the application using the package and `scdf-values.yml` in the current directory.

src/deploy/carvel/configure-database.sh

@@ -5,7 +5,8 @@ fi
 
 SCDIR=$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")
 if [ "$4" = "" ]; then
-    echo "<app> <database> <url> <secret-name> [secret-username-key] [secret-password-key]"
+    echo "<app> <database> <url> <username/secret-name> [password/secret-username-key] [secret-password-key]"
+    echo "  If username / password is provided it will be assigned to the values file."
     exit 1
 fi