[GHC] #7290: Minor documentation fix for directory

[GHC]

#7290: Minor documentation fix for directory
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 Reporter:  SimonHengel       |          Owner:                   
     Type:  bug               |         Status:  new              
 Priority:  normal            |      Component:  libraries (other)
  Version:  7.6.1             |       Keywords:                   
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple 
  Failure:  None/Unknown      |       Testcase:                   
Blockedby:                    |       Blocking:                   
  Related:                    |  
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7290>
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