Fix violations of G-7460

Author: PhilippSalvisberg

docs/4-language-usage/7-stored-objects/4-functions/g-7440.md

@@ -11,7 +11,9 @@ A function should return all its data through the `return` clause. Having an `ou
 
 ``` sql
 create or replace package body my_package is
-   function my_function(out_date out date) return boolean is
+   function my_function(out_date out date) return boolean
+      deterministic
+   is
    begin
       out_date := sysdate;
       return true;
@@ -24,7 +26,9 @@ end my_package;
 
 ``` sql
 create or replace package body my_package is
-   function my_function return date is
+   function my_function return date
+      deterministic
+   is
    begin
       return sysdate;
    end my_function;