Expand note to use Ruff with other language server in Kate (#12806)

## Summary

Provide instructions to use Ruff together with other servers in the Kate
editor.
Because Kate does not support running multiple servers for the same
language, one needs to use the ``python-lsp-server`` (pylsp) tool.

---------

Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com>

docs/editors/setup.md

@@ -310,7 +310,12 @@ See [LSP Client documentation](https://docs.kde.org/stable5/en/kate/kate/kate-ap
 on how to configure the server from there.
 
 !!! important
-    Kate's LSP Client plugin does not support multiple servers for the same language.
+    Kate's LSP Client plugin does not support multiple servers for the same language. As a
+    workaround, you can use the [`python-lsp-server`](https://github.com/python-lsp/python-lsp-server)
+    along with the [`python-lsp-ruff`](https://github.com/python-lsp/python-lsp-ruff) plugin to
+    use Ruff alongside another language server. Note that this setup won't use the [server settings](settings.md)
+    because the [`python-lsp-ruff`](https://github.com/python-lsp/python-lsp-ruff) plugin uses the
+    `ruff` executable and not the language server.
 
 ## Sublime Text