Update index.yml (#27183)

Changes forms to forums (line 37)

Author: katiesavage

docs/csharp/index.yml

@@ -34,7 +34,7 @@ landingContent:
         links:
           - text: "C# on Q&A"
             url: /answers/topics/dotnet-csharp.html
-          - text: "Languages on .NET tech community forms"
+          - text: "Languages on .NET tech community forums"
             url: https://techcommunity.microsoft.com/t5/languages/bd-p/languages
           - text: "C# on Stack Overflow"
             url: https://stackoverflow.com/questions/tagged/c%23