[GHC] #14099: Document fundeps

[GHC]

#14099: Document fundeps
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Documentation  |           Version:  8.2.1
           Keywords:  newcomers      |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Currently the documentation for functional dependencies in the GHC user's
 guide is quite poor. Fix this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14099>
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