Merge the following from the English version:
1.120 -> 1.140 handbook/x11/chapter.sgml
Submitted by: Hiroki Kobayashi <solidsneak at hyper.cx>
Review by: Hiroo Ono <hiroo _at_ jp dot FreeBSD dot org>, ryusuke
References: [doc-jp-work 1526, 1527, 1528, 1798]
Approved by: hrs (mentor)