[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:  7.10.1
             Component:              |          Version:  7.9
  Documentation                      |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:  #1880
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * version:  7.8.2 => 7.9
 * related:   => #1880
 * milestone:   => 7.10.1


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9248#comment:1>
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