Sync with English Revisions, plus translation of the DHCP section:
disks/chapter.sgml: 1.221 -> 1.222
network-servers/chapter.sgml: 1.29 -> 1.30
x11/chapter.sgml: 1.150 -> 1.152

Approved by: murray (mentor)
Obtained from: The FreeBSD Simplified Chinese Project CVS