MFen: 1.14 -> 1.20 en_US.ISO8859-1/articles/laptop/article.sgml

. Mark up HorizSync and VertRefresh with <literal>
. Use &os; instead of "FreeBSD"
. Point to the `FreeBSD Laptop Compatibility List' web pages
. Point to the freebsd-mobile mailing list
. Use &xfree86; instead to refer to XFree86
. Pull in all the article-related SGML entities, instead of

including each sgml entity list by itself