[Buildbot] #3266: document change to remote_interruptCommand

[Buildbot trac]

#3266: document change to remote_interruptCommand
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Reporter:  yetanotherion  |      Owner:  <default>
    Type:  task           |     Status:  new
Priority:  major          |  Milestone:  0.9.0
 Version:  master         |   Keywords:  docs
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 the change to remoteInterruptCommand needs to be documented in
 master/docs/developer/cls-protocols.rst

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Ticket URL: <http://trac.buildbot.net/ticket/3266>
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Buildbot: build/test automation