Change PROCEDURE to FUNCTION in CREATE OPERATOR syntax

Peter Eisentraut <peter_e@gmx.net>

Commit: d12782898eb5979bef3c6dd0d80b93d1aaf53cac
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-08-22T12:44:49Z
Releases: 12.0
Change PROCEDURE to FUNCTION in CREATE OPERATOR syntax

Since procedures are now a different thing from functions, change the
CREATE OPERATOR syntax to use FUNCTION in the clause that specifies the
function.  PROCEDURE is still accepted for compatibility.

Reported-by: Peter Geoghegan <pg@bowt.ie>
Reviewed-by: Jonathan S. Katz <jonathan.katz@excoventures.com>

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