Fix: Client issues link to use the good first issue label (#6264)

Author: LucaLanziani

docs/community/contributing.md

@@ -35,7 +35,7 @@ following components, look for GitHub issues marked with the good first issue la
 - **Knative Client (kn):**
 
     - To get started with contributing, see the [Client development workflow](https://github.com/knative/client/blob/main/docs/DEVELOPMENT.md).
-    - For good starter issues, see [Client issues](https://github.com/knative/client/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3Akind%2Fgood-first-issue).
+    - For good starter issues, see [Client issues](https://github.com/knative/client/issues?q=is%3Aissue%20is%3Aopen%20sort%3Aupdated-desc%20label%3A%22good%20first%20issue%22).
 
 - **Functions:**