Add docstring examples and tests for mkdocstrings and mktestdocs #1083
Description
Where does the documentation need improvement?
While porting the docs to zensical, I noticed some differences in the params and code. It would be nice to have a universal source of truth we can easily maintain and update, from the docstrings.
What needs to be changed?
Describe what's currently wrong or what could be better.
Additional context
Add any other context about the documentation issue here.