Add another link for workspaces with pixi.

Author: tobiasraabe

docs/source/how_to_guides/using_workspaces.md

@@ -47,5 +47,6 @@ uv provides excellent support for workspaces which you can read more about in th
 
 pixi is still working on a native workspace experience, but there are workarounds.
 
+- [https://pixi.sh/latest/build/workspace/](https://pixi.sh/latest/build/workspace/)
 - [https://github.com/prefix-dev/pixi/discussions/387](https://github.com/prefix-dev/pixi/discussions/387)
 - [https://github.com/Andre-Medina/python-pixi-mono-template](https://github.com/Andre-Medina/python-pixi-mono-template)