[1.6.x] Fixed #20679 -- Corrected CachedFilesMixin.post_process docstring.
[1.6.x] Fixed #20679 -- Corrected CachedFilesMixin.post_process docstring.

Thanks bmispelon for the report.

Backport of 9b88dd3809 from master

django-nonrel/django,django-nonrel/django,redhat-openstack/django,felixjimenez/django,felixjimenez/django,redhat-openstack/django,redhat-openstack/django,redhat-openstack/django,dex4er/django,dex4er/django,django-nonrel/django,django-nonrel/django,dex4er/django,felixjimenez/django,felixjimenez/django