[Buildbot] #3395: document what is working with multi master in 0.9

[Buildbot trac]

#3395: document what is working with multi master in 0.9
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Reporter:  tardyp       |       Owner:  dustin
    Type:  enhancement  |      Status:  assigned
Priority:  major        |   Milestone:  0.9.0
 Version:  master       |  Resolution:
Keywords:  docs         |
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Comment (by tardyp):

 https://github.com/buildbot/buildbot/pull/2291

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Ticket URL: <http://trac.buildbot.net/ticket/3395#comment:3>
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