[GHC] #12404: Document version availability for each language extension

[GHC]

#12404: Document version availability for each language extension
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        Reporter:  dfeuer            |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Documentation     |              Version:  8.0.1
      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):

 Fwiw, there is [wiki:LanguagePragmaHistory].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12404#comment:1>
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