Update toc.yml

Author: jeffwmartinez

articles/app-service/toc.yml

@@ -468,6 +468,8 @@
       href: ../azure-resource-manager/management/azure-subscription-service-limits.md#app-service-limits
     - name: Service Updates
       href: https://azure.microsoft.com/updates/?product=app-service
+    - name: Language support policy
+      href: language-support-policy.md
     - name: Kudu service
       href: resources-kudu.md
     - name: Best practices