Plugins and extensions

Intersphinx

https://docs.readthedocs.io/en/stable/guides/intersphinx.html

Set up conf.py:

intersphinx_mapping = {
    'sphinx': ('https://www.sphinx-doc.org/en/master/', None),
}

Sample references:

- :ref:`sphinx:ref-role`
- :ref:`:ref: role <sphinx:ref-role>`
- :doc:`sphinx:usage/extensions/intersphinx`
- :doc:`Intersphinx <sphinx:usage/extensions/intersphinx>`