[1.6.x] Added missing request argument to example in URL dispatcher docs
[1.6.x] Added missing request argument to example in URL dispatcher docs

Backport of a0c58113b9 from master

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