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doc: Remove unnecessary RETURN statements from example.

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Original file line number	Diff line number	Diff line change
`@@ -3999,13 +3999,10 @@ CREATE OR REPLACE FUNCTION process_emp_audit() RETURNS TRIGGER AS $emp_audit$`
`3999`	`3999`	`--`
`4000`	`4000`	`IF (TG_OP = 'DELETE') THEN`
`4001`	`4001`	`INSERT INTO emp_audit SELECT 'D', now(), user, OLD.*;`
`4002`		`- RETURN OLD;`
`4003`	`4002`	`ELSIF (TG_OP = 'UPDATE') THEN`
`4004`	`4003`	`INSERT INTO emp_audit SELECT 'U', now(), user, NEW.*;`
`4005`		`- RETURN NEW;`
`4006`	`4004`	`ELSIF (TG_OP = 'INSERT') THEN`
`4007`	`4005`	`INSERT INTO emp_audit SELECT 'I', now(), user, NEW.*;`
`4008`		`- RETURN NEW;`
`4009`	`4006`	`END IF;`
`4010`	`4007`	`RETURN NULL; -- result is ignored since this is an AFTER trigger`
`4011`	`4008`	`END;`

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