Merge pull request #42579 from cherylmc/toc3

update

Author: GitHubber17

articles/vpn-gateway/TOC.yml

@@ -30,6 +30,8 @@
     href: vpn-gateway-highlyavailable.md
   - name: About Point-to-Site connections
     href: point-to-site-about.md
+  - name: About Point-to-Site VPN routing
+    href: vpn-gateway-about-point-to-site-routing.md
 - name: How-to guides
   items:
   - name: Configure Site-to-Site connections