[Buildbot] #2823: Force scheduler docs inconsistent

[Buildbot trac]

#2823: Force scheduler docs inconsistent
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Reporter:  dustin       |       Owner:  tardyp
    Type:  defect       |      Status:  new
Priority:  major        |   Milestone:  0.9.0
 Version:  0.8.9        |  Resolution:
Keywords:  force, docs  |
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Comment (by sa2ajj):

 The `codebases` parameter is not mandatory (at least, this is what I see
 in the code).  And the relevant code is definitely older than this ticket.

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Ticket URL: <http://trac.buildbot.net/ticket/2823#comment:2>
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