Cleanup some docstrings.

Change-Id: I5df869ec2eda6d3cd5dd26d940cc74b1d209c7f6
Reviewed-on: https://review.openstack.org/30816
Reviewed-by: Sean Dague <sean@dague.net>
Approved: Joe Gordon <joe.gordon0@gmail.com>
Reviewed-by: Joe Gordon <joe.gordon0@gmail.com>
Tested-by: Jenkins