https://pum-is.readthedocs.io/en/latest/
This GitHub template includes fictional Python library with some basic Sphinx docs.
Read the readthedocs tutorial here:
https://docs.readthedocs.io/en/stable/tutorial/
Editing in readthedocs reStructuredText https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html
Documentation standards PEP 0287 https://www.python.org/dev/peps/pep-0287/