[GHC] #9248: Document -XHaskell98 and -XHaskell2010 in flag reference

[GHC]

#9248: Document -XHaskell98 and -XHaskell2010 in flag reference
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        Reporter:  goldfire          |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Documentation     |              Version:  7.9
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #1880             |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * milestone:   => 8.2.1


Comment:

 This should really be done.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9248#comment:6>
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