Fix #104 - Fixed bad example in rule G-4210 so it only violates one rule

Author: kibeha

docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4210.md

@@ -11,7 +11,7 @@
 
 ``` sql
 declare
-   l_color varchar2(7 char);
+   l_color types_up.color_code_type;
 begin
    if l_color = constants_up.co_red then
       my_package.do_red();