[Sqlalchemy-tickets] [sqlalchemy] #2777: update class-level mapper event docs

[sqlalchemy <mi...@zz...>]

#2777: update class-level mapper event docs
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 Reporter:  zzzeek         |           Owner:  zzzeek
     Type:  defect         |          Status:  new
 Priority:  high           |       Milestone:  0.8.xx
Component:  documentation  |        Severity:  minor - half an hour
 Keywords:                 |  Progress State:  in queue
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 "This listener can generally only be applied to the Mapper class overall."
 - incorrect, you can apply instrument_class to an abstract base as well.

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Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2777>
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