[Buildbot] #3433: p4client argument description is incorrect

[Buildbot trac]

#3433: p4client argument description is incorrect
----------------------+--------------------
Reporter:  rutsky     |      Owner:  rutsky
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  0.9.0
 Version:  master     |   Keywords:
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 https://github.com/buildbot/buildbot/blame/master/master/docs/manual/cfg-
 buildsteps.rst#L738:

 {{{

 ``p4client``
     (optional): The name of the client to use.
     In ``mode='full'`` and ``mode='incremental'``, it's particularly
 important that a unique name is used for each checkout directory to avoid
 incorrect synchronization.
     For this reason, Python percent substitution will be performed on this
 value to replace %(slave)s with the slave name and %(builder)s with the
 builder name.
     The default is `buildbot_%(slave)s_%(build)s`.
 }}}

 I believe should be `%(prop:slavename)s` instead of `%(slave)s`, and
 `%(prop:buildername)s` instead of `%(builder)s` or `%(build)s`.

 Will be fixed in bug #2340.

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Ticket URL: <http://trac.buildbot.net/ticket/3433>
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Buildbot: build/test automation