The page at http://fedora.redhat.com/docs/release-notes/fc4/errata/ is encoded in UTF-8, but the server does not give a correct Content-Type: header when serving it. HTTP 1.1 defines the default charset as iso8859-1 if not otherwise specified, so the server should be specifying UTF-8 if it's going to give a UTF-8 page.
Page appears to have a suitable meta http-equiv tag now.