Cosmetic doc fixes.

Change-Id: I753c663dbfeef0cfc94be8b146bad4170b0c0f89
Reviewed-on: https://review.openstack.org/28714
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins