[GHC] #11659: configure --help incorrectly says --docdir is still unversioned by default

[GHC]

#11659: configure --help incorrectly says --docdir is still unversioned by default
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           Reporter:  juhpetersen    |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.0.1-rc1
           Keywords:                 |  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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 In ghc-8.0.1 it seems docdir is no longer unversioned (#11354) by default,
 however 'configure --help' still says the default value is unversioned.
 This is a bit confusing.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11659>
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