[Buildbot] #2998: sphinx doc output a warning

[Buildbot trac]

#2998: sphinx doc output a warning
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Reporter:  Ben               |       Owner:  Mikhail Sobolev <mss@…>
    Type:  defect            |      Status:  closed
Priority:  patches-accepted  |   Milestone:  undecided
 Version:  master            |  Resolution:  fixed
Keywords:  docs              |
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Comment (by dustin):

 With this change, does sphinx exit with status 1 on that warning?

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Ticket URL: <http://trac.buildbot.net/ticket/2998#comment:3>
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