[Buildbot] #3434: documentation for non-existent class SlaveProxyObject

[Buildbot trac]

#3434: documentation for non-existent class SlaveProxyObject
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Reporter:  rutsky     |      Owner:  rutsky
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  0.9.0
 Version:  master     |   Keywords:
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 Here:

 https://github.com/buildbot/buildbot/blame/master/master/docs/developer
 /cls-protocols.rst#L124

 Should I delete it?

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Ticket URL: <http://trac.buildbot.net/ticket/3434>
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