[GHC] #8193: document :kind! in ghci built-in help

[GHC]

#8193: document :kind! in ghci built-in help
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       Reporter:  rwbarton          |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  GHCi              |           Version:  7.4.2
       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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 Patch attached.

 I have the wording as:
 {{{
    :kind[!] <type>             show the kind of <type>
                                (!: also show the normalised type)
 }}}
 could use some tweaking perhaps.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8193>
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