edited the toc

Author: SnehaSudhirG

articles/update-manager/toc.yml

@@ -21,14 +21,16 @@ items:
     items:
     - name: Supported regions
       href: supported-regions.md
-  - name: Supported operating systems
-    items:
-    - name: Check for Updates, One time update, Periodic assessment and Customer managed Schedules
-      href: support-matrix-updates.md
-    - name: Automatic VM Guest Patching
-      href: support-matrix-automatic-guest-patching.md
-    - name: Support matrix
-      href: support-matrix.md
+    - name: Supported operating systems
+      items:
+      - name: Check for Updates, One time update, Periodic assessment and Customer managed Schedules
+        href: support-matrix-updates.md
+      - name: Automatic VM Guest Patching
+        href: support-matrix-automatic-guest-patching.md
+    - name: Supported update types and update sources
+      items:
+      - name: Support matrix
+        href: support-matrix.md
 - name: Quickstarts
   items:
   - name: Check and install on-demand updates