Update TOC node

Author: flang-msft

articles/partner-solutions/informatica/toc.yml

@@ -18,10 +18,13 @@ items:
     href: informatica-manage.md
   - name: Manage your advanced serverless runtime and Informatica IDMC organization
     href: informatica-manage-serverless.md
-  - name: Troubleshoot an Informatica IDMC organization
-    href: informatica-troubleshoot.md
-  - name: Get support for an Informatica IDMC organization
-    href: informatica-get-support.md
+    - name: Troubleshoot
+      expanded: true
+      items:
+      - name: Troubleshoot an Informatica IDMC organization
+        href: informatica-troubleshoot.md
+      - name: Get support for an Informatica IDMC organization
+        href: informatica-get-support.md
 - name: Reference
   items:
   - name: Python