[1.6.x] Fixed #22613 -- Added formfield_for_choice_field() to the list of methods that InlineModelAdmin supports.

Backport of 986bd41f8a from master
[1.6.x] Added 1.6.5 release note for refs #22508.

Backport of 13087020a9 from master
[1.6.x] Fixed #22619 -- Corrected description of os.path.

Thanks Collin Anderson for the report.

Backport of a1be7237ca from master