Update feedback link in release notes for 9.0.15 (#10362)

Author: SusLes

release-notes/9.0/9.0.15/9.0.15.md

@@ -74,7 +74,7 @@ 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 #]() for your questions and comments.
+Your feedback is important and appreciated. We've created an issue at [dotnet/core 10356](https://github.com/dotnet/core/issues/10356) for your questions and comments.
 
 [9.0.313]: 9.0.15.md
 [9.0.116]: 9.0.116.md