[GHC] #7644: Hackage docs for base library contain broken links

[GHC]

#7644: Hackage docs for base library contain broken links
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        Reporter:  JulesBean         |                Owner:  hvr
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Documentation     |              Version:  7.6.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by thomie):

 There are still many dead links. For example the link to `par` on the page
 http://hackage.haskell.org/package/ghc-prim-0.4.0.0/docs/GHC-Magic.html. I
 guess it has something to do with `parallel` not being built by default.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7644#comment:8>
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