[Buildbot] #2998: sphinx doc output a warning

[Buildbot trac]

#2998: sphinx doc output a warning
-----------------------------+-----------------------
Reporter:  Ben               |      Owner:
    Type:  defect            |     Status:  new
Priority:  patches-accepted  |  Milestone:  undecided
 Version:  master            |   Keywords:  docs
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 {{{
 sphinx-build -b singlehtml -d _build/doctrees  -q -W . _build/singlehtml
 MISSING BB REFERENCE: bb:msg:buildset.$bsid.new
 }}}

 As a side-note, I thought we had a no-warning sphinx policy ?

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