add link

Author: zhiyuanliang-ms

articles/azure-app-configuration/TOC.yml

@@ -330,6 +330,8 @@
       href: ./configuration-provider-overview.md
     - name: .NET
       items:
+      - name: Feature reference
+        href: ./reference-dotnet-provider.md
       - name: API reference
         href: /dotnet/api/Microsoft.Extensions.Configuration.AzureAppConfiguration
       - name: Azure SDK for .NET

articles/azure-app-configuration/index.yml

@@ -188,7 +188,7 @@ landingContent:
         - text: Overview
           url: configuration-provider-overview.md
         - text: .NET provider
-          url: /dotnet/api/Microsoft.Extensions.Configuration.AzureAppConfiguration
+          url: reference-dotnet-provider.md
         - text: Java Spring provider
           url: https://go.microsoft.com/fwlink/?linkid=2180917
         - text: Python provider