[GHC] #3706: "GHC Commentary" link in HACKING is broken

[GHC]

#3706: "GHC Commentary" link in HACKING is broken
---------------------------------+------------------------------------------
    Reporter:  jli               |       Owner:                   
        Type:  bug               |      Status:  new              
    Priority:  normal            |   Component:  Documentation    
     Version:  6.10.4            |    Keywords:  broken link      
          Os:  Unknown/Multiple  |    Testcase:                   
Architecture:  Unknown/Multiple  |     Failure:  Documentation bug
---------------------------------+------------------------------------------
 The HACKING file links to <
 http://hackage.haskell.org/trac/wiki/Commentary >, but the correct link (I
 assume) is < http://hackage.haskell.org/trac/ghc/wiki/Commentary >.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3706>
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