[jQuery] (validate) - Documentation fix for highlight/unhighlight

Hi there,

When overriding the highlight/unhighlight methods, the examples
provided in the documentation will not work:
http://docs.jquery.com/Plugins/Validation/validate#toptions

They should instead read:
 highlight: function( element, errorClass, validClass ) {
   $(element).addClass(errorClass).removeClass(validClass);
 },
 unhighlight: function( element, errorClass, validClass ) {
   $(element).removeClass(errorClass).addClass(validClass);
 }

Thanks,
Dirk