api-ref: Remove broken link
api-ref: Remove broken link

The api-ref has no module documentation, thus the module index link
gives a 404, see
https://developer.openstack.org/api-ref/identity/py-modindex.html

Remove it.

Also, remove obsolete generated comment.

Change-Id: I3d8290c94ff3046adeff26975377bc10afcb02d3

mahak/keystone,openstack/keystone,mahak/keystone,openstack/keystone,mahak/keystone,openstack/keystone