[GHC] #7409: Document special "this" module name for PackageImports extension

[GHC]

#7409: Document special "this" module name for PackageImports extension
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    Reporter:  hvr               |       Owner:  simonmar         
        Type:  bug               |      Status:  merge            
    Priority:  normal            |   Milestone:  7.6.2            
   Component:  Compiler          |     Version:  7.6.1            
    Keywords:                    |          Os:  Unknown/Multiple 
Architecture:  Unknown/Multiple  |     Failure:  Documentation bug
  Difficulty:  Unknown           |    Testcase:                   
   Blockedby:                    |    Blocking:                   
     Related:                    |  
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Changes (by simonmar):

  * status:  new => merge
  * difficulty:  => Unknown
  * milestone:  => 7.6.2


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7409#comment:2>
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