Update toc.yml

Updated the TOC, added a section for the new page 'Tutorial Create an NS NSX Tier-1 Gateway

Author: riperez123

articles/azure-vmware/toc.yml

@@ -33,13 +33,15 @@ items:
     href: tutorial-configure-networking.md
   - name: 4 - Access a private cloud
     href: tutorial-access-private-cloud.md
-  - name: 5 - Create an NSX network segment
+  - name: 5 - Create an NSX Tier-1 Gateway
+    href: tutorial-nsx-tier-1-gateway.md
+  - name: 6 - Create an NSX network segment
     href: tutorial-nsx-t-network-segment.md
-  - name: 6 - Peer on-premises to private cloud
+  - name: 7 - Peer on-premises to private cloud
     href: tutorial-expressroute-global-reach-private-cloud.md
-  - name: 7 - Scale a private cloud
+  - name: 8 - Scale a private cloud
     href: tutorial-scale-private-cloud.md
-  - name: 8 - Delete a private cloud
+  - name: 9 - Delete a private cloud
     href: tutorial-delete-private-cloud.md
 - name: Cost optimization
   items: