Book tweak.
Book tweak.

Suggested by: Yves Bergeron <yves.bergeron@shq.gouv.qc.ca>

* ch04.xml:  don't mention Subversion 1.0 specifically.

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