chore: Change xref to file link until docs are really docfx generated

Author: DevTKSS

doc/articles/introduction.md

@@ -16,5 +16,5 @@ Visit the [API Documentation](../api/) for a Reference created from the Sourceco
 To give you a quick overview of this Documentation, here is a List of quick links to the included Sample Apps. For future and more detailed Information, please lookup the depending Chapter via the Table of Contents.
 
 - MvuxGallery
-  - [Docs](xref:DevTKSS.Uno.SampleApps.MvuxGallery.Overview)
+  - [Docs](./MvuxGallery/Overview.md)
   - [source code:](../src/DevTKSS.Uno.Samples.MvuxGallery/)