Log Message:
-----------
Add argument name to syntax.
Modified Files:
--------------
pgsql-server/doc/src/sgml/ref:
create_function.sgml (r1.56 -> r1.57)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/create_function.sgml.diff?r1=1.56&r2=1.57)