docs: adding more test examples

subjects/java/checkpoints/factory-blueprint/README.md

@@ -4,8 +4,6 @@
 
 You are given an incomplete Factory design pattern implementation with some incorrect parts. Complete and fix the class to demonstrate your understanding of how the Factory design pattern works.
 
-The method `showDetails` should print the class name 'ConcreteProductA' for `ConcreteProductA` and so on.
-
 ### Expected Classes
 
 ```java
@@ -70,8 +68,8 @@ public class ExerciseRunner {
 ```shell
 $ javac *.java -d build
 $ java -cp build ExerciseRunner
-This is ConcreteProductA
+This is ConcreteProductA.
-This is ConcreteProductB
+This is ConcreteProductB.
 Invalid product type
 $
 ```