Log Message:
-----------
Add some minimal documentation that the SQL standard requires parentheses
after ONLY.
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
select.sgml (r1.116 -> r1.117)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/select.sgml?r1=1.116&r2=1.117)