[GHC] #13079: Fixed typo in docs

[GHC]

#13079: Fixed typo in docs
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        Reporter:  forki             |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  lowest            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by forki):

 * status:  new => patch


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13079#comment:1>
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