[GHC] #1034: Added examples, more detailed documentation to Data.List functions of "Extracting sublists" section

[GHC]

#1034: Added examples, more detailed documentation to Data.List functions of
"Extracting sublists" section
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    Reporter:  guest           |       Owner:          
        Type:  proposal        |      Status:  new     
    Priority:  normal          |   Milestone:          
   Component:  libraries/base  |     Version:  6.6     
    Severity:  minor           |    Keywords:          
  Difficulty:  Easy (1 hr)     |    Testcase:          
Architecture:  Unknown         |          Os:  Multiple
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Goal of my changes it to make list functions more accessible to Haskell
 newcomers.
 "Extracting sublists" section seems to have less complete documentation
 than rest of the module.

 Added examples for all the functions.
 Added easier to understand summaries for composite functions.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1034>
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