[Buildbot] #3635: Improved Buildstep Docs

[Buildbot trac]

#3635: Improved Buildstep Docs
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Reporter:  wangofett    |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  minor        |   Milestone:  undecided
 Version:  0.9.0        |  Resolution:
Keywords:  docs         |
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Comment (by wangofett):

 Reading just the documentation, how would you know that a GitPoller
 provides a branch? How would you know that there is anything besides the
 build itself that provides a branch? It's not mentioned in the tutorial -
 and I don't even think that the GitPoller documents that it provides a
 branch name to the build that will be used in the build.

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Ticket URL: <http://trac.buildbot.net/ticket/3635#comment:2>
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