[GHC] #11354: Install script installs docs without -version suffix

[GHC]

#11354: Install script installs docs without -version suffix
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        Reporter:  osa1              |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Build System      |              Version:  7.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1868
       Wiki Page:                    |
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Comment (by juhpetersen):

 I think this is not refected in the 'configure --help' output which still
 says docdir defaults to [DATAROOTDIR/doc/ghc], which is confusing.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11354#comment:7>
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