pgsql: Correct keywords table for status of COLLATE vs LC_COLLATE.

Log Message:
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Correct keywords table for status of COLLATE vs
LC_COLLATE.

Modified Files:
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pgsql/doc/src/sgml:
keywords.sgml (r2.24 -> r2.25)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/keywords.sgml?r1=2.24&r2=2.25)