• Merge the following from the English version:

1.33 -> 1.72 basics/chapter.sgml
1.168 -> 1.222 mirrors/chapter.sgml
1.75 -> 1.82 x11/chapter.sgml

Submitted by: KOMACHI Mamoru <c10344@mail.ecc.u-tokyo.ac.jp>
Reviewed by: Hideyuki KURASHINA <rushani@bl.mmtr.or.jp>, hrs
References: [doc-jp-work 411,417]

• Merge changes of 1.60->1.61 partially (moving mount-unmount section) to unbreak build:
  
  disks/chapter.sgml