[1.6.x] Fixed some markup in docs/ref/templates/api.txt
[1.6.x] Fixed some markup in docs/ref/templates/api.txt

Backport of 862a04a56d from master

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