[haddock] #84: Document << picure-URL >> syntax

[haddock]

#84: Document << picure-URL >> syntax
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Reporter:  waern   |       Owner:       
    Type:  defect  |      Status:  new  
Priority:  minor   |   Milestone:  2.6.0
 Version:          |    Keywords:       
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Ticket URL: <http://trac.haskell.org/haddock/ticket/84>
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