[GHC] #3684: Missing ghc-pkg options in --help

[GHC]

#3684: Missing ghc-pkg options in --help
---------------------------------+------------------------------------------
    Reporter:  kolmodin          |       Owner:                   
        Type:  bug               |      Status:  new              
    Priority:  normal            |   Component:  ghc-pkg          
     Version:  6.12.1 RC1        |    Keywords:                   
          Os:  Unknown/Multiple  |    Testcase:                   
Architecture:  Unknown/Multiple  |     Failure:  Documentation bug
---------------------------------+------------------------------------------
 {{{ghc-pkg}}} does not in {{{--help}}} say it can do {{{recache}}}.

 Any other missing commands?

 Could also use some trivial line-edits for the commands {{{dot}}} and
 {{{find-module}}}.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3684>
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