Comment 1 for bug 1659710

Best I can tell, there's nothing needed herein from a neutron doc (devref or apiref) POV. The respective change that generated this bug already contained devref updates [1].

As per [2] the 'notification_drivers' config option is deprecated for QoS; therefore we need to update the associated config ref.

Moving this to openstack-manuals.

[1] https://review.openstack.org/#/c/396651/29/doc/source/devref/quality_of_service.rst
[2] https://review.openstack.org/#/c/396651/29/neutron/conf/services/qos_driver_manager.py