[TASK] Update GitHub description in CONTRIBUTING.md

Releases: master
Resolves: #88535
Change-Id: Ibeb645965840c8c4e78f5e4d13272db32e9fc308
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60933


Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>

CONTRIBUTING.md

@@ -7,7 +7,7 @@ Have a look at our [detailed contribution walkthrough][1].
 
 If you like to contribute code, please use the [main git repository][2], all changes are
  processed in our [review system][3]. The [GitHub repository][4] is a synchronized
- mirror of the primary git repository and pull requests via GitHub are not supported at the moment.
+ mirror of the primary git repository, pull requests via GitHub will be moved to our review system automatically.
 
 If you like to contribute to our [documentation][5], use the "Edit me on GitHub" button
  in the top right of each manual or reference or just make a pull request in any of the repositories
@@ -18,4 +18,4 @@ If you like to contribute to our [documentation][5], use the "Edit me on GitHub"
 [3]: https://review.typo3.org/#/q/project:Packages/TYPO3.CMS,n,z
 [4]: https://github.com/TYPO3/TYPO3.CMS
 [5]: https://docs.typo3.org/typo3cms/
-[6]: https://github.com/TYPO3-Documentation
\ No newline at end of file
+[6]: https://github.com/TYPO3-Documentation