Log Message:
-----------
Add additional PITR documentation.
Simon Riggs
Modified Files:
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pgsql/doc/src/sgml:
backup.sgml (r2.108 -> r2.109)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/backup.sgml?r1=2.108&r2=2.109)