pgsql: Remove documentation of log_restartpoints setting, which is

Log Message:
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Remove documentation of log_restartpoints setting, which is obsoleted
in favor of log_checkpoints. Fujii Masao

Modified Files:
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pgsql/doc/src/sgml:
backup.sgml (r2.122 -> r2.123)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/backup.sgml?r1=2.122&r2=2.123)