doc: builder pattern 👷🏻‍♀️

Author: dancergraham

chapter04_factory/readme.md

@@ -24,7 +24,7 @@ Rhino.
 
 For instance the `PizzaIngredientFactory` abstract class defines an interface for a family of products.
 
-** Builder **
+**Builder 👷🏻‍♀️**
 
 When the object creation gets more complex with a number of distinct steps then the Builder pattern comes in, 
 esseantially using a Template method to put all of the creation steps together.