[GHC] #8788: Remove old comment

[GHC]

#8788: Remove old comment
-------------------------------+-------------------------------------------
        Reporter:  Tarrasch    |            Owner:  simonmar
            Type:  task        |           Status:  new
        Priority:  lowest      |        Milestone:
       Component:  Runtime     |          Version:  7.6.3
  System                       |         Keywords:
      Resolution:              |     Architecture:  Unknown/Multiple
Operating System:              |       Difficulty:  Easy (less than 1 hour)
  Unknown/Multiple             |       Blocked By:
 Type of failure:              |  Related Tickets:
  None/Unknown                 |
       Test Case:              |
        Blocking:              |
-------------------------------+-------------------------------------------
Changes (by crockeea):

 * difficulty:  Unknown => Easy (less than 1 hour)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8788#comment:1>
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