Log Message:
-----------
Add documentation for format_type(), which somehow escaped it before.
Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.236 -> r1.237)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.236&r2=1.237)