fix link

Author: asudbring

articles/virtual-network/toc.yml

@@ -247,7 +247,7 @@
   - name: VM networking
     items:      
     - name: Migrate a virtual machine public IP address
-      href: ../virtual-network/nat-gateway/tutorial-migrate-ilip-nat.md?toc=/azure/virtual-machines/toc.json
+      href: ../virtual-network/nat-gateway/tutorial-migrate-ilip-nat.md?toc=/azure/virtual-network/toc.json
     - name: Add or remove network interfaces
       href: virtual-network-network-interface-vm.md
     - name: Create VM - multiple NICs