Update TOC.yml

Author: msftadam

articles/operator-service-manager/TOC.yml

@@ -110,6 +110,8 @@
     href: how-to-manage-artifacts-nexus.md
   - name: Push and pull artifacts for virtualized network functions (VNF) on Azure
     href: how-to-manage-artifacts-virtualized-network-function-cloud.md
+  - name: Manage network function operator extension
+    href: install-network-function-operator.md
 - name: Troubleshooting
   expanded: false
   items: