Fix a documentation typo.
Fix a documentation typo.

Suggested by: Joey Smith <joey@inter-net-solutions.com>

* doc/book/book/appc.xml:
  Add "be".

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