Log Message:-----------Doc tweak: add an xref.
Modified Files:-------------- pgsql/doc/src/sgml: func.sgml (r1.377 -> r1.378) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.377&r2=1.378)