MFde: Update the German documentation set.

doc/de_DE.ISO8859-1/articles/contributing-ports/article.sgml fixes only
doc/de_DE.ISO8859-1/articles/version-guide/article.sgml 1.10 -> 1.11
doc/de_DE.ISO8859-1/books/handbook/advanced-networking/chapter.sgml 1.397 -> 1.399
doc/de_DE.ISO8859-1/books/handbook/basics/chapter.sgml 1.148 -> 1.149
doc/de_DE.ISO8859-1/books/handbook/disks/chapter.sgml 1.274 -> 1.277
doc/de_DE.ISO8859-1/books/handbook/firewalls/chapter.sgml 1.76 -> 1.77
doc/de_DE.ISO8859-1/books/handbook/kernelconfig/chapter.sgml 1.174 -> 1.176
doc/de_DE.ISO8859-1/books/handbook/ports/chapter.sgml 1.267 -> 1.268
doc/de_DE.ISO8859-1/books/handbook/security/chapter.sgml 1.312 -> 1.315
doc/de_DE.ISO8859-1/books/porters-handbook/book.sgml 1.867 -> 1.878

Obtained from: The FreeBSD German Documentation Project.