[Fedora-haskell] important notices for Fedora Haskell repo users

* Some Important Notice for users of Fedora Haskell - The repo url has changed slightly: please remove "RPMS.stable" from the end of urls points to the repo in your yum.repo.d config file. Please see http://haskell.org/fedora/ for more details. - A repository is now available for FC4. Thanks for using Fedora Haskell.