[GHC] #16280: Update Latest page of User's Guide to GHC 8.6.3

[GHC]

#16280: Update Latest page of User's Guide to GHC 8.6.3
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           Reporter:  wataru86       |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.3
           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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 Latest version of GHC is 8.6.3.
 However, latest page of User's Guide is
 8.6.2(https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/index.html).

 Please Update to GHC 8.6.3.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16280>
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