Book fix.
Book fix.

Patch by: Florian Zumbiehl <florz@gmx.de>

* doc/book/book/ch06.xml:  @ is an "at" symbol, not an ampersand.  duh.

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