Update feedback issue link in release notes (#10361)

Author: SusLes

release-notes/8.0/8.0.26/8.0.26.md

@@ -72,7 +72,7 @@ You need [Visual Studio 17.10](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.
 
 [8.0.420]: 8.0.26.md
 [8.0.126]: 8.0.126.md