doc: Point the clone instructions at the right repository

Every repo's CONTRIBUTING.md told contributors to clone cuos. The .github
copy is the org-wide default shown for repos without their own, so it uses
a placeholder rather than naming a repository.

Signed-off-by: Simon Walz <contact@simonwalz.de>

Author: simonwalz

CONTRIBUTING.md

@@ -28,8 +28,8 @@ Click the **Fork** button on GitHub to create your own copy of the project.
 ### 2. Clone Your Fork
 
 ```bash
-git clone https://github.com/your-username/cuos.git
-cd cuos
+git clone https://github.com/your-username/<repository>.git
+cd <repository>
 ```
 
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