Update feedback issue link in release notes

Updated Feedback Link

Author: victorisr

release-notes/8.0/8.0.12/8.0.12.md

@@ -75,7 +75,7 @@ You need [Visual Studio 17.12](https://visualstudio.microsoft.com) or later to u
 
 ## Feedback
 
-Your feedback is important and appreciated. We've created an issue at [dotnet/core #xxxx](https://github.com/dotnet/core/issues/xxxx) for your questions and comments.
+Your feedback is important and appreciated. We've created an issue at [dotnet/core #9691](https://github.com/dotnet/core/issues/9691) for your questions and comments.
 
 [blob-runtime]: https://builds.dotnet.microsoft.com/dotnet/Runtime/
 [blob-sdk]: https://builds.dotnet.microsoft.com/dotnet/Sdk/

release-notes/9.0/9.0.1/9.0.1.md

@@ -82,7 +82,7 @@ You need [Visual Studio 17.12](https://visualstudio.microsoft.com) or later to u
 
 ## Feedback
 
-Your feedback is important and appreciated. We've created an issue at [dotnet/core #xxxx](https://github.com/dotnet/core/issues/xxxx) for your questions and comments.
+Your feedback is important and appreciated. We've created an issue at [dotnet/core #9691](https://github.com/dotnet/core/issues/9691) for your questions and comments.
 
 [blob-runtime]: https://builds.dotnet.microsoft.com/dotnet/Runtime/
 [blob-sdk]: https://builds.dotnet.microsoft.com/dotnet/Sdk/