PR Summary

Realized that this was quite inconsistent. It is still not really consistent, but I doubted half-ways that there is a preferred way...

Related to #23680 (almost closes it...)

So, is there are preferred way among

import matplotlib as mpl
...
mp.rcParams[...]

and

from matplotlib import rcParams
...
rcParams[...]

?

PR Checklist

Tests and Styling

• Has pytest style unit tests (and pytest passes).
• Is Flake 8 compliant (install flake8-docstrings and run flake8 --docstring-convention=all).

Documentation

• New features are documented, with examples if plot related.
• New features have an entry in doc/users/next_whats_new/ (follow instructions in README.rst there).
• API changes documented in doc/api/next_api_changes/ (follow instructions in README.rst there).
• Documentation is sphinx and numpydoc compliant (the docs should build without error).