[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
       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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 http://www.haskell.org/ghc/docs/7.8.2/html/users_guide/wrong-compilee.html

 The option '-hi-diffs' does not exist but '-ddump-hi-diffs' does. Please
 update the docs.

 Thanks.

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