[vector] #82: Merge "Unfolding" section into "Construction" in the docs

[vector]

#82: Merge "Unfolding" section into "Construction" in the docs
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Reporter:  rl        |       Owner:      
    Type:  defect    |      Status:  new 
Priority:  critical  |   Milestone:  0.10
 Version:            |    Keywords:      
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Ticket URL: <http://trac.haskell.org/vector/ticket/82>
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