'tox -e docs' commads failing with "Duplicate explicit target name" error

[sonu]

while we run the following command-

`tox -e docs`

It fails with "Duplicate explicit target name" error.

Reference: http://paste.openstack.org/show/507589/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/329749

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/329749
Committed: https://git.openstack.org/cgit/openstack/designate/commit/?id=9cb82bf7fd1d28c788716b49164c2df2f4b3f920
Submitter: Jenkins
Branch: master

commit 9cb82bf7fd1d28c788716b49164c2df2f4b3f920
Author: Tin Lam <email address hidden>
Date: Tue Jun 14 22:31:30 2016 -0500

    Fix 'Duplicate explicit target name' error in 'tox -e docs'

    Resolved duplicate target names in documentation resulting in error
    indicated in [1].

    [1] http://paste.openstack.org/show/507589/

    Change-Id: Ia5bc4a2be32b506dbd68a1a2ee341cbeb7af407d
    Closes-Bug: #1588734

[Davanum Srinivas (DIMS) (dims-v)]

This issue was fixed in the openstack/designate 3.0.0.0b2 development milestone.