Add --inherited to the role docs
Add --inherited to the role docs

commit Id72670be8640e5c6e2490a6ef849e9ec3493b1a9 forgot to update
the docs for role.rst.

Change-Id: I97c426ea9b290fc266b34cb0bf97de56cfd098de

redhat-openstack/python-openstackclient,openstack/python-openstackclient,openstack/python-openstackclient,dtroyer/python-openstackclient,dtroyer/python-openstackclient,BjoernT/python-openstackclient,redhat-openstack/python-openstackclient,BjoernT/python-openstackclient