add create or replace to examples in G-9040

Author: PhilippSalvisberg

docs/4-language-usage/9-function-usage/g-9040.md

@@ -14,7 +14,7 @@ The exception to this rule can be if you are converting textual input typed by a
 ## Example (bad)
 
 ``` sql
-create package body employee_api is
+create or replace package body employee_api is
    procedure set_dob(in_employee_id in employees.employee_id%type
                     ,in_dob_str     in varchar2) is
    begin
@@ -29,7 +29,7 @@ end employee_api;
 ## Example (good)
 
 ``` sql
-create package body employee_api is
+create or replace package body employee_api is
    procedure set_dob(in_employee_id in employees.employee_id%type
                     ,in_dob_str     in varchar2) is
    begin