edited toc

Author: asudbring

articles/virtual-network/ip-services/toc.yml

@@ -114,6 +114,10 @@ items:
         href: associate-public-ip-address-vm.md
       - name: Dissociate public IP address from a VM
         href: remove-public-ip-address-vm.md
+      - name: Add dual-stack network to an existing VM
+        items:
+        - name: Portal
+          href: add-dual-stack-ipv6-vm-portal.md
       - name: Create VM - dual-stack network
         items:
         - name: Portal