Title overline too short when run manila docs

[junboli]

$ tox -e docs

Warning, treated as error:
/home/commit/manila/doc/source/configuration/shared-file-systems/drivers/dell-emc-unity-driver.rst:1:Title overline too short.

===============
Dell EMC Unity driver
===============
ERROR: InvocationError: '/home/commit/manila/.tox/docs/bin/sphinx-build -W -b html doc/source doc/build/html'
__________________________________________________________________________________________________________________ summary __________________________________________________________________________________________________________________
ERROR: docs: commands failed

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/566232

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/566232
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=6d82f675b88ab8135e86f939f3fdab762085558c
Submitter: Zuul
Branch: master

commit 6d82f675b88ab8135e86f939f3fdab762085558c
Author: junboli <email address hidden>
Date: Fri May 4 00:00:00 2018 +0800

    Fix title overline too short when generate docs

    when running tox -e docs locally, it failed because
    the title overline too short.

    Change-Id: I9b1d85f12ff559e032c465d7737e9c27efb459c3
    Closes-bug: #1769073

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/manila 7.0.0.0b2 development milestone.