[GHC] #9179: Documentation suggests to use '-hi-diffs' but it should be '-ddump-hi-diffs'

[GHC]

#9179: Documentation suggests to use '-hi-diffs' but it should be '-ddump-hi-
diffs'
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        Reporter:  shalehperry        |            Owner:
            Type:  bug                |           Status:  new
        Priority:  normal             |        Milestone:
       Component:  Documentation      |          Version:  7.8.2
      Resolution:                     |         Keywords:
Operating System:  Unknown/Multiple   |     Architecture:  Unknown/Multiple
 Type of failure:  Documentation bug  |       Difficulty:  Unknown
       Test Case:                     |       Blocked By:
        Blocking:                     |  Related Tickets:
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Comment (by nomeata):

 Thanks for noticing, fixed and pushed.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9179#comment:2>
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