Fix violations of G-7460

Author: PhilippSalvisberg

docs/4-language-usage/7-stored-objects/4-functions/g-7450.md

@@ -11,7 +11,9 @@ If a boolean function returns `null`, the caller has do deal with it. This makes
 
 ``` sql
 create or replace package body my_package is
-   function my_function return boolean is
+   function my_function return boolean
+      deterministic
+   is
    begin
       return null;
    end my_function;
@@ -23,7 +25,9 @@ end my_package;
 
 ``` sql
 create or replace package body my_package is
-   function my_function return boolean is
+   function my_function return boolean
+      deterministic
+   is
    begin
       return true;
    end my_function;