Fixed #19477 - Documented generic_inlineformset_factory

Thanks epicserve for the suggestion.
Fixed #19633 - Discouraged use of gunicorn's Django integration.
Remove dup_select_related method.

This undocumented method was used in an old version of the admin, is
totally untested and hails from 2008. Although it's listed in the
"public methods" section, as it's not documented or used I don't think
it needs a deprecation path.

If we think it's useful I'll write some tests/docs for it instead...
Merge pull request #666 from mjtamlyn/dup-select-related

Remove dup_select_related method.
Fixed #19610 - Added enctype note to forms topics doc.

Thanks will@ for the suggestion.
Merge remote-tracking branch 'upstream/master'