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

[GHC]

#9248: Document -XHaskell98 and -XHaskell2010 in flag reference
------------------------------------+-------------------------------------
       Reporter:  goldfire          |             Owner:  goldfire
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Documentation     |           Version:  7.8.2
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
------------------------------------+-------------------------------------


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9248>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler