Merge pull request #270380 from duongau/patch-7

ExpressRoute TOC (add az gateway article to TOC)

Author: v-shils

articles/expressroute/TOC.yml

@@ -58,7 +58,9 @@
     - name: Moving circuits from classic to Resource Manager
       href: expressroute-move.md
   - name: About ExpressRoute gateways
-    href: expressroute-about-virtual-network-gateways.md
+    href: expressroute-about-virtual-network-gateways.md?toc=/azure/expressroute/toc.json
+  - name: About zone-redundant gateways for Availability Zones
+    href: ../vpn-gateway/about-zone-redundant-vnet-gateways.md
   - name: About ExpressRoute FastPath
     href: about-fastpath.md
   - name: About ExpressRoute Direct