[1.6.x] Fixed typo in inspectdb docs
[1.6.x] Fixed typo in inspectdb docs

Backport of 1131d4191f from master

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