[Buildbot] #3663: cleanup list of spelling errors

[Buildbot trac]

#3663: cleanup list of spelling errors
-------------------+-----------------------
Reporter:  rutsky  |      Owner:
    Type:  defect  |     Status:  new
Priority:  major   |  Milestone:  undecided
 Version:  0.9.3   |   Keywords:  easy
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 Currently
 [https://github.com/buildbot/buildbot/blob/master/master/docs/spelling_wordlist.txt
 spelling exceptions in docs] constructed simply by adding all errors into
 it.

 This was done to enable spelling and to prevent new spelling errors,
 without doing large initial change.

 This spelling exceptions list should be reviewed and errors should be
 fixed.

 If https://github.com/buildbot/buildbot/pull/2608 will be merged, list of
 spelling errors found by pylint in source code should be reviewed too.

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Ticket URL: <http://trac.buildbot.net/ticket/3663>
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