add short titles to frontmatter (#20131)

content/admin/github-actions/advanced-configuration-and-troubleshooting/high-availability-for-github-actions.md

@@ -12,6 +12,7 @@ topics:
   - Storage
 redirect_from:
   - /admin/github-actions/high-availability-for-github-actions
+shortTitle: HA for GitHub Actions
 ---
 ## Replication or redundancy of your {% data variables.product.prodname_actions %} data
 

content/admin/github-actions/advanced-configuration-and-troubleshooting/index.md

@@ -10,5 +10,6 @@ children:
   - /backing-up-and-restoring-github-enterprise-server-with-github-actions-enabled
   - /using-a-staging-environment
   - /troubleshooting-github-actions-for-your-enterprise
+shortTitle: HA & troubleshooting
 ---
 

content/admin/github-actions/advanced-configuration-and-troubleshooting/troubleshooting-github-actions-for-your-enterprise.md

@@ -8,6 +8,7 @@ topics:
   - Enterprise
 redirect_from:
   - /admin/github-actions/troubleshooting-github-actions-for-your-enterprise
+shortTitle: Troubleshoot GitHub Actions
 ---
 ## Configuring self-hosted runners when using a self-signed certificate for {% data variables.product.prodname_ghe_server %}
 

content/admin/github-actions/advanced-configuration-and-troubleshooting/using-a-staging-environment.md

@@ -11,6 +11,7 @@ topics:
   - Upgrades
 redirect_from:
   - /admin/github-actions/using-a-staging-environment
+shortTitle: Use a staging area
 ---
 It can be useful to have a staging or testing environment for {% data variables.product.product_location %}, so that you can test updates or new features before implementing them in your production environment.