Comment 4 for bug 1710673

Reviewed: https://review.openstack.org/493670
Committed: https://git.openstack.org/cgit/openstack/sahara/commit/?id=04661996b378eea728d3aed5ca2cccdf42c0add3
Submitter: Jenkins
Branch: stable/pike

commit 04661996b378eea728d3aed5ca2cccdf42c0add3
Author: Luigi Toscano <email address hidden>
Date: Mon Aug 14 19:36:43 2017 +0200

    Cleanup the last warning on doc building (html and man)

    - Quote the hyphens so that they are shown unchanged
    Closes-Bug: #1710628

    - Restructure the Feature-by-Plugin table, simplifying
      it a bit so that the generation of man pages does not
      issue a warning (and so that the looks on the HTML
      version is still acceptable). It looks like the
      man page generator is more limited.
    Closes-Bug: #1710608

    - Add the missing help entry to a configuration key,
      removing a warning
    Closes-Bug: #1710673

    Change-Id: I010b4a9114e6b21068b6d48243ac0a292a3bb497
    (cherry picked from commit 8b3843b6173ec51bc7dea6057bd3ca50224d615a)