[haskell-platform] #172: Typo in man page

[haskell-platform]

#172: Typo in man page
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 Reporter:  erikd    |       Owner:  SimonMarlow
     Type:  defect   |      Status:  new        
 Priority:  trivial  |   Milestone:             
Component:  alex     |    Keywords:             
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 Man page contains the word 'messsages' (3 's'es).

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Ticket URL: <http://trac.haskell.org/haskell-platform/ticket/172>
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