[Buildbot] #2998: sphinx doc output a warning

[Buildbot trac]

#2998: sphinx doc output a warning
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Reporter:  Ben               |       Owner:
    Type:  defect            |      Status:  new
Priority:  patches-accepted  |   Milestone:  undecided
 Version:  master            |  Resolution:
Keywords:  docs              |
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Comment (by Ben):

 Handled by GH-1330

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Ticket URL: <http://trac.buildbot.net/ticket/2998#comment:1>
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