o Merge the following from the English version:
1.175 -> 1.176 book.sgml
o Add some missing changes in the previous commit:
mirrors/chapter.sgml
References : [doc-jp-work 2014, 2015]
o Merge the following from the English version:
1.167 -> 1.173 x11/chapter.sgml
Submitted by: Hiroo Ono <hiroo _at_ jp dot FreeBSD dot org>
References: [doc-jp-work 1695, 1758, 1827]
Approved by: hrs (mentor)