Retire x/dox (step 2)
Retire x/dox (step 2)

Retire x/dox, it's unused: This is step 2, removing the jobs.

Announcement:
http://lists.openstack.org/pipermail/openstack-discuss/2020-January/011855.html

Change-Id: Ie5cb53886eb543fa1457619cb854a6da78b1c068
Needed-By: https://review.opendev.org/701443

openstack-infra/project-config,openstack-infra/project-config