[haddock] #37: Hide instances that are "internal" to a module

[haddock]

#37: Hide instances that are "internal" to a module
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Reporter:  waern        |        Owner:     
    Type:  enhancement  |       Status:  new
Priority:  minor        |    Milestone:     
 Version:               |   Resolution:     
Keywords:               |  
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Changes (by nibro):

 * cc: nibro (added)

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Ticket URL: <http://trac.haskell.org/haddock/ticket/37#comment:3>
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