[1.6.x] Fixed #22644 -- Clarified documentation for NamedUrlWizardView

Backport of 727d048f0991ccbd1564c6fb225ffbfd2f1a2102 from master.
[1.6.x] Fixed #22647 -- Documented redirect_field_name keyword argument for user_passes_test.

Backport of 268670a3a4 from master