* doc/book/book/ch02.xml   (The Limitations of Mixed Revisions): Grammar fix.
* doc/book/book/ch02.xml
  (The Limitations of Mixed Revisions): Grammar fix.

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