MFbed: Update the German documentation set.

books/faq/book.sgml 1.789 -> 1.790
books/handbook/config/chapter.sgml 1.223 -> 1.225
books/handbook/desktop/chapter.sgml 1.66 -> 1.69
books/handbook/disks/chapter.sgml 1.267 -> 1.268
books/handbook/install/chapter.sgml 1.337 -> 1.339
books/handbook/mail/chapter.sgml 1.134 -> 1.135
books/handbook/mirrors/chapter.sgml 1.420 -> 1.421
books/handbook/multimedia/chapter.sgml 1.118 -> 1.119
books/handbook/ppp-and-slip/chapter.sgml 1.173 -> 1.175
books/handbook/security/chapter.sgml 1.307 -> 1.308
books/handbook/x11/chapter.sgml 1.177 -> 1.178

Obtained from: The FreeBSD German Documentation Project.