Log Message:-----------Minor doc tweak: replace a "--" with "—".
Modified Files:-------------- pgsql/doc/src/sgml: ddl.sgml (r1.59 -> r1.60) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ddl.sgml.diff?r1=1.59&r2=1.60)