Added TOC entry

Author: mbender-ms

articles/virtual-network-manager/TOC.yml

@@ -33,7 +33,8 @@
       href: concept-network-groups.md
     - name: Azure Policy integration with network groups
       href: concept-azure-policy-integration.md
-
+    - name: Cross-tenant connection support
+    href: concept-cross-tenant.md
   - name: Configuration types
     items:
     - name: Connectivity