Update feedback issue link in release notes

Author: rbhanda

release-notes/9.0/9.0.12/9.0.12.md

@@ -59,7 +59,7 @@ 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 #XXXXX](https://github.com/dotnet/core/issues/XXXXX) for your questions and comments.
+Your feedback is important and appreciated. We've created an issue at [dotnet/core #10204](https://github.com/dotnet/core/issues/10204) for your questions and comments.
 
 [9.0.309]: 9.0.12.md
 [9.0.113]: 9.0.113.md