[Buildbot] #2929: document BuildStep renderables variable

[Buildbot trac]

#2929: document BuildStep renderables variable
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Reporter:  vlovich       |       Owner:
    Type:  task          |      Status:  new
Priority:  major         |   Milestone:  0.9.+
 Version:  0.8.9         |  Resolution:
Keywords:  docs, simple  |
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Comment (by vlovich):

 Something else.  This is referring to the "renderables" property on the
 BuildStep class that you extend for custom steps.  BuildBot reads this
 variable to render those properties on the custom step before invoking
 run.  There's not (or wasn't when I wrote the bug) any such documentation
 describing this process.

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Ticket URL: <http://trac.buildbot.net/ticket/2929#comment:3>
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