MFbed: Update the German Handbook.

books/handbook/book.sgml fixes only [*]
books/handbook/advanced-networking/chapter.sgml 1.350 -> 1.354
books/handbook/introduction/chapter.sgml 1.102 -> 1.103
books/handbook/linuxemu/chapter.sgml 1.115 -> 1.117
books/handbook/network-servers/chapter.sgml 1.38 -> 1.43

Obtained from: The FreeBSD German Documentation Project.

Approved by: mheinen (mentor)

Submitted by: Andreas Braun <camouflagex@gmx.de>