[GHC] #8239: Wrong link in docs

[GHC]

#8239: Wrong link in docs
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        Reporter:  nomeata           |            Owner:
            Type:  bug               |           Status:  closed
        Priority:  normal            |        Milestone:
       Component:  Documentation     |          Version:  7.6.3
      Resolution:  fixed             |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 Sorry; I have deleted by branch because the patch was already applied, and
 I don’t like lingering branches in my repo.

 A stable link to the fix is [df614779c356ea6aef29367a8dd1ca819b03a1d1].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8239#comment:3>
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