Merge the following from the English version:
1.92->1.120 handbook/x11/chapter.sgml
Submitted by: Hiroki Kobayashi <solidsneak _at_ hyper.cx>
Reviewed by: Hiroo Ono <hiroo _at_ jp dot FreeBSD dot org>, ryusuke
References: [doc-jp-work 1503, 1524, 1525, 1528, 1529, 1540, 1566,
1599, 1638, 1798, 1799]
Approved by: hrs (mentor)