Synchronize with Simplified Chinese Project's repository:

Sync handbook with English revisions:
1.67 -> 1.69 bibliography/chapter.sgml
1.174 -> 1.181 config/chapter.sgml
1.140 -> 1.142 kernelconfig/chapter.sgml
1.120 -> 1.121 mail/chapter.sgml
1.356 -> 1.357 mirrors/chapter.sgml
1.30 -> 1.31 network-servers/chapter.sgml
1.242 -> 1.246 pgpkeys/chapter.sgml
1.225 -> 1.228 security/chapter.sgml
1.47 -> 1.48 users/chapter.sgml
1.152 -> 1.154 x11/chapter.sgml

Typo corrections and language improvements:
handbook/basics/chapter.sgml [1] [2]
handbook/install/chapter.sgml [1]
handbook/introduction/chapter.sgml [1]
handbook/kernelconfig/chapter.sgml [3] [4]
handbook/serialcomms/chapter.sgml
sgml/authors.ent

Spotted by: jellen [1], ubet [2], Neptune[3] on the FreeBSDChina

		community forum, delphij

Work done by: delphij, gavin (FreeBSD.org.cn) [4]
Obtained from: The FreeBSD Simplified Chinese Project CVS
Approved by: murray (mentor)