Fix some issues in enforcement.rst
Fix some issues in enforcement.rst

Some document corrections of content and command examples in
doc/source/enforcement.rst. Please refer to the patch for details.

Change-Id: Ia5bc16b8edbeb0097f4ee816a74c4d6c7a674b87
Closes-Bug: #1476560

ramineni/my_congress,ekcs/congress,ramineni/my_congress,openstack/congress,ramineni/my_congress,ekcs/congress,ekcs/congress,openstack/congress,ekcs/congress,ramineni/my_congress