fixed typo on docstring
Fixes #21833 -- Fix UserSettingsHolder.is_overridden() and add tests.
Fix a check_framework test so it doesn't fail when TEST_RUNNER is set (e.g. on CI).
Removed some stray newlines which caused flake8 issues
Changed django-admin back to django-admin.py. Refs #21827
Corrected problem with MySQL checks handler and related fields.
Merge pull request #2186 from zemanel/master

Fixed typo on docstring
Fixed #21827 -- Install django-admin and django-admin.py

We need to figure out how to deprecate django-admin.py, but for now this
should do the trick.