clarify comment at top of Config.hs
clarify comment at top of Config.hs

There appears to be some confusion -- several people have wanted to edit
Config.hs as was done in the past. This comment probably won't stop that, but
it's a start.

darcs-hash:20071111191304-78224-3267de9d4e8da0ef07e58e9cf2135b2ab652445c

Happy-Ferret/xmonad