Add TOC topic

Author: AmandaAZ

support/azure/automation/toc.yml

@@ -1,7 +1,9 @@
 - name: Welcome
   href: welcome-automation.yml
-- name: Troubleshoot runbook execution issues when using PowerShell
-  href: runbooks/powershell-job-script-cmdlets-not-working.md
+  - name: Runbook not working as expected
+    items:
+    - name: Troubleshoot runbook execution issues when using PowerShell
+      href: runbooks/powershell-job-script-cmdlets-not-working.md
 - name: Automation modifications aren't reflected in the portal
   href: configuration/modifications-not-reflect-portal.md
 - name: Capture diagnostics information