[Fedora Infrastructure] #5296: remove el6-docs koji tag, docs-backend01 host

[fedora-badges]

#5296: remove el6-docs koji tag, docs-backend01 host
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  Reporter:  immanetize  |      Owner:  sysadmin-members
      Type:  change      |     Status:  new
  Priority:  minor       |  Milestone:  HANDWAVY-FUTURE
 Component:  General     |    Version:
  Severity:  Normal      |   Keywords:
Blocked By:              |   Blocking:
 Sensitive:  0           |
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 Hello, Docs did not implement the publishing stack that the el6-docs koji
 tag was created for.  This tag can be removed, as well as the docs-
 backend01 host that was intended to process packages from this tag.

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Ticket URL: <https://fedorahosted.org/fedora-infrastructure/ticket/5296>
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