[GHC] #9249: Link to "latest" user's guide

[GHC]

#9249: Link to "latest" user's guide
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              Reporter:  goldfire    |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  low         |        Milestone:
             Component:              |          Version:  7.8.2
  Documentation                      |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by thomie):

 Similar issues for hackage:
 https://github.com/haskell/cabal/issues/750
 https://github.com/haskell/hackage-server/issues/61#issuecomment-24742342
 https://github.com/haskell/hackage-server/issues/198

 There it is suggested to use canonical urls:
 https://support.google.com/webmasters/answer/139066?rd=1

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9249#comment:1>
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