[GHC] #13079: Fix typo in comment

[GHC]

#13079: Fix typo in comment
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        Reporter:  forki             |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  lowest            |            Milestone:  8.2.1
       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):  Phab:D2939
       Wiki Page:                    |
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Comment (by forki):

 @RyanGlScott I did what HACKING.m/"Contributing patches to GHC in a hurry"
 said.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13079#comment:4>
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