[1.6.x] Fixed #21902 -- Documented search order for list_display.
[1.6.x] Fixed #21902 -- Documented search order for list_display.

Backport of 09b725f51bbfa0f01b27ee2d718889926d409519 from master.

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