[1.6.x] Fixed docstring typo, thanks minddust.
[1.6.x] Fixed docstring typo, thanks minddust.

Backport of d3ed15b79d from master

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