Fixed docs/ref/contrib/auth.txt so that sphinx links work properly.
Fixed #8162 -- Increased Permission.name max_length to 255 characters.
Removed reference to old middleware
Fixed #22756 -- Added view name to technical 404 template if Http404 is raised.

Thanks Keryn Knight for the suggestion.
Fixed #21942 -- Moved Form.clean() to form API docs.

Thanks cjerdonek for the suggestion.
Fixed #19489 -- Documented host parameter of assertRedirects().

Thanks mrknacky at gmail.com for the report and gajimenezmaggiora
for the draft patch.
Made docs CSS for versionchanged/added more similar to docs.djangoproject.com.
Fixed #22482 -- Recommended using data migrations in contrib.sites docs.

Thanks scibi for the report.
Fixed non-multiple of 4 indentation in docs/ref/request-response.txt.
Fixed #21755, #21832 -- Added FK support to REQUIRED_FIELDS and USERNAME_FIELD.