Log Message:
-----------
Clarify name of file to be checked for PITR expiring.
Modified Files:
--------------
pgsql/doc/src/sgml:
backup.sgml (r2.60 -> r2.61)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/backup.sgml.diff?r1=2.60&r2=2.61)