[GHC] #14213: Improve the documentation of seq function

[GHC]

#14213: Improve the documentation of seq function
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           Reporter:  sibi           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Documentation  |           Version:  8.2.1
           Keywords:                 |  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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 While the current documentation is fine, I think it would be better if it
 was mentioned explicitly that the first argument would be evaluated to
 `WHNF`. For a while, I was confused if it gets reduced to WHNF or NF.

 I can volunteer to send the patch if there is no objection to this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14213>
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