[GHC] #3939: remove obsolete todo item

[GHC]

#3939: remove obsolete todo item
---------------------------------+------------------------------------------
    Reporter:  dagit             |       Owner:                
        Type:  bug               |      Status:  new           
    Priority:  normal            |   Component:  libraries/base
     Version:  6.12.1            |    Keywords:                
          Os:  Unknown/Multiple  |    Testcase:                
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown  
---------------------------------+------------------------------------------
 libraries/base/GHC/IO/Handle/Text.hs has an obsolete ToDo item which can
 be confusing.  It should be removed.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3939>
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