Log Message:
-----------
Example for create function using argument names
Gavin Sherry
Modified Files:
--------------
pgsql-server/doc/src/sgml/ref:
create_function.sgml (r1.57 -> r1.58)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/create_function.sgml.diff?r1=1.57&r2=1.58)