MFde: Update the German Documentation set.
doc/de_DE.ISO8859-1/books/faq/book.sgml 1.1014 -> 1.1056
doc/de_DE.ISO8859-1/share/sgml/freebsd.dsl 1.20 -> 1.22
doc/de_DE.ISO8859-1/share/sgml/mailing-lists.ent 1.67 -> 1.68
Obtained from: The FreeBSD German Documentation Project
Contributed by: Benedict Reuschling (benedict ett reuschling dott org)