ci(GITHUB): standardize workflow headers

.github/workflows/self-test.yml

@@ -1,10 +1,10 @@
 ---
 name: ansible-workbench-self-test
 
-# Required Github Repository Secrets:
-# REMOTE_TOKEN      - GitHub token with access to the test repository.
-# REMOTE_ORIGIN     - The git remote repository name (organization/repo).
-# SLACK_WEBHOOK     - The slack webhook for build notifications.
+# Required GitHub Repository Secrets:
+# REMOTE_ORIGIN              (Required, to identify the test repository: organization/repo.)
+# REMOTE_TOKEN               (Required, for GitHub token with access to the test repository.)
+# SLACK_WEBHOOK              (Optional, for Slack notifications...)
 
 on:
   push:

{{cookiecutter.project_slug}}/.github/workflows/push.yml

@@ -2,7 +2,7 @@
 name: {{ cookiecutter.project_slug }}-push
 
 # Workflow Secrets:
-# SLACK_WEBHOOK              (Required, for slack notifications...)
+# SLACK_WEBHOOK              (Optional, for Slack notifications...)
 
 on:
   push:

{{cookiecutter.project_slug}}/.github/workflows/release.yml

@@ -2,8 +2,8 @@
 name: {{ cookiecutter.project_slug }}-publish-to-galaxy
 
 # Workflow Secrets:
-# SLACK_WEBHOOK              (Required, for slack notifications...)
-# GALAXY_API_KEY             (Required, for Ansible Galaxy Import...)
+# SLACK_WEBHOOK              (Optional, for Slack notifications...)
+# GALAXY_API_KEY             (Optional, for Ansible Galaxy Import...)
 
 on:
   release: