I have not found any obvious place to report problems about the documentation, so I'm doing it here
The Project Pythia Unstructured Grid Visualization Cookbook link is broken, on the following page
https://uxarray.readthedocs.io/en/latest/tutorials.html
I came across another Pythia broken link on another page, but I don't remember which one. I assume you can easily find/grep this in the documentation sources