Log Message:
-----------
Add note that not all SQL commands support ONLY in the same way.
Modified Files:
--------------
pgsql/doc/src/sgml:
ddl.sgml (r1.84 -> r1.85)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ddl.sgml?r1=1.84&r2=1.85)