Bump copyright year to reflect changes in years 2007 (e.g. [1]) and 2008
(e.g. [2])

[1] http://www.freebsd.org/cgi/cvsweb.cgi/doc/en_US.ISO8859-1/books/fdp-primer/stylesheets/chapter.sgml
[2] http://www.freebsd.org/cgi/cvsweb.cgi/doc/en_US.ISO8859-1/books/fdp-primer/the-website/chapter.sgml

Approved by: gabor (mentor)