Fix contributing guide label links (#10913)

Author: Mirochill

docs/contributing.md

@@ -112,7 +112,7 @@ editing the existing content to be more accessible, or creating new content such
 
 {{% note %}}
 GitHub [Discussions](https://github.com/python-poetry/poetry/discussions) and the
-[kind/question label](https://github.com/python-poetry/poetry/labels/kind/question) are excellent sources for FAQ
+[kind/question label](https://github.com/python-poetry/poetry/labels/kind%2Fquestion) are excellent sources for FAQ
 candidates.
 {{% /note %}}
 
@@ -265,8 +265,7 @@ pipx install --suffix @pr1234 git+https://github.com/python-poetry/poetry.git@re
   [Documentation]: {{< ref "/docs" >}}
   [FAQ]: {{< relref "faq" >}}
   [Issue Tracker]: https://github.com/python-poetry/poetry/issues
-  [area/docs label]: https://github.com/python-poetry/poetry/labels/area/docs
-  [kind/question label]: https://github.com/python-poetry/poetry/labels/kind/question
+  [area/docs label]: https://github.com/python-poetry/poetry/labels/area%2Fdocs
   [Issue Template]: https://github.com/python-poetry/poetry/issues/new/choose
   [Discussions]: https://github.com/python-poetry/poetry/discussions
   [Discord]: https://discord.com/invite/awxPgve