[GHC] #4317: Add comments to the definition of IODeviceType (module GHC.IO.Device)

[GHC]

#4317: Add comments to the definition of IODeviceType (module GHC.IO.Device)
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    Reporter:  golubovsky        |        Owner:  simonmar         
        Type:  proposal          |       Status:  new              
    Priority:  normal            |    Milestone:  7.0.1            
   Component:  libraries/base    |      Version:  6.12.3           
    Keywords:                    |     Testcase:                   
   Blockedby:                    |   Difficulty:                   
          Os:  Unknown/Multiple  |     Blocking:                   
Architecture:  Unknown/Multiple  |      Failure:  Documentation bug
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Comment(by igloo):

 I'm not following. `getDirectoryContents` returns a list.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4317#comment:6>
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