[GHC] #11419: Binary distributions seem to lack haddock docs

[GHC]

#11419: Binary distributions seem to lack haddock docs
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Build System      |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 There were a few issues with `mkDocs`,

  * the `ghc` directory now has a version number suffix, as mentioned in
 comment:2.
  * it was looking for a gzip archive, not a xz archive.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11419#comment:3>
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