Log Message:
-----------
Minor documentation improvements for new string_agg aggregate.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        func.sgml (r1.499 -> r1.500)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.499&r2=1.500)

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