Fix link

Author: adegeo

docs/navigate/migration-guide/index.yml

@@ -79,7 +79,7 @@ landingContent:
           - text: .NET on Q&A
             url: /answers/products/dotnet
           - text: .NET tech community forums
-            url: https://techcommunity.microsoft.com/t5/net/ct-p/dotnet
+            url: https://techcommunity.microsoft.com/category/dotnet
       - linkListType: learn
         links:
           - text: Porting documentation index