Thread: pgsql-server: Update pitr docs to mention inclusive/exclusive xid

Log Message:
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Update pitr docs to mention inclusive/exclusive xid specification

Modified Files:
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    pgsql-server/doc/src/sgml:
        backup.sgml (r2.44 -> r2.45)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/backup.sgml.diff?r1=2.44&r2=2.45)