Remove ":py" domain from roles

[Tim Graham]

In the documentation source files, there's some confusion about roles like :py:class:`email.message.EmailMessage`. In this case, py indicates the Python language ​domain (which means any code written in Python, not Python built-ins in particular).

Since the Python domain is the default in Sphinx, you can omit the :py prefix when referring to Python objects, for example, using :class: instead of :py:class:.

Including :py ensures clarity and avoids ambiguity if other domains are also in use., but since the Django documentation doesn't use other domains (C++, JavaScript, etc.), I see no reason to include the prefix.

[Sarah Boyce <42296566+sarahboyce@…>]

In 3c0c5435:

Fixed #36570 -- Removed unnecessary :py domain from documentation roles.

Signed-off-by: SaJH <wogur981208@…>

[Sarah Boyce <42296566+sarahboyce@…>]

In 05bac8c4:

Refs #36570 -- Added sphinxlint checker to flag unnecessary :py domain in documentation roles.