[1.6.x] Fixed #5726 -- Documented that inspectdb doesn't detect defaults.
[1.6.x] Fixed #5726 -- Documented that inspectdb doesn't detect defaults.

Backport of 15cafaa565 from master

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