Log Message:
-----------
Minor copy-editing.
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
postgres-ref.sgml (r1.50 -> r1.51)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/postgres-ref.sgml.diff?r1=1.50&r2=1.51)
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