patch applied (ghc): Standalone deriving wibbles: keyword is ' derive' not ' derived' ; and add flag documentation

[Simon Peyton Jones]

Tue Jan  2 08:17:52 PST 2007  simonpj at microsoft.com
  * Standalone deriving wibbles: keyword is 'derive' not 'derived'; and add flag documentation

    M ./compiler/parser/Lexer.x -3 +3
    M ./compiler/parser/Parser.y.pp -3 +3
    M ./docs/users_guide/glasgow_exts.xml -1 +1