[GHC] #7501: Some GHCi options are undocummented

[GHC]

#7501: Some GHCi options are undocummented
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    Reporter:  monoidal          |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:                  
   Component:  Documentation     |     Version:  7.6.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by simonmar):

  * difficulty:  => Unknown


Comment:

 `:check` has been around for a long time (I traced it back to 2005), I
 think it is only for debugging, and we don't want to document it.

 I'll add docs for `:showi`, I think that was an oversight.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7501#comment:3>
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