[GHC] #15733: Several links in GHC.Exts.Heap documentation are broken

[GHC]

#15733: Several links in GHC.Exts.Heap documentation are broken
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           Reporter:  mpickering     |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.1
           Keywords:  newcomer       |  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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 There are some broken links in the GHC.Exts.Heap documentation.

 https://downloads.haskell.org/~ghc/latest/docs/html/libraries/ghc-
 heap-8.6.1/GHC-Exts-Heap.html

 For example, in `GenClosure`, the first link is wrong and redirects.

 http://hackage.haskell.org/trac/ghc/browser/includes/rts/storage/Closures.h

 Similarly in the definition of `StgInfoTable`. Those are the two I found.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15733>
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