MFde: Update the German documentation set
doc/de_DE.ISO8859-1/books/handbook/advanced-networking/chapter.sgml 1.426 -> 1.430 + fixes
doc/de_DE.ISO8859-1/books/handbook/bibliography/chapter.sgml 1.87 -> 1.88
doc/de_DE.ISO8859-1/books/handbook/network-servers/chapter.sgml 1.116 -> 1.122
Obtained from: The FreeBSD German Documentation Project