#6415: remove el6-docs target/tags/etc

[Fedora Release Engineering]

#6415: remove el6-docs target/tags/etc
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 Reporter:  kevin            |       Owner:  rel-eng@…
     Type:  task             |      Status:  new
Milestone:  Fedora 24 Final  |   Component:  koji
 Keywords:                   |  Blocked By:
 Blocking:                   |
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 Docs is not going to implement this setup, so they no longer need or want
 the el6-docs target and tags. Remove them from koji.

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Ticket URL: <https://fedorahosted.org/rel-eng/ticket/6415>
Fedora Release Engineering <http://fedorahosted.org/rel-eng>
Release Engineering for the Fedora Project