Book fix.
Book fix.

Patch by: Jens B. Jorgensen <jens.jorgensen@tallan.com>

* doc/book/book/ch06.xml
  ssl-authorities-file has been supplanted by ssl-authority-files.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion