Improve Builder Javadoc

builder/src/main/java/com/iluwatar/builder/App.java

@@ -4,7 +4,20 @@
 
 /**
  * 
- * This is the Builder pattern variation as described by Joshua Bloch in
+ * The intention of the Builder pattern is to find a solution to the telescoping 
+ * constructor anti-pattern. The telescoping constructor anti-pattern occurs when the 
+ * increase of object constructor parameter combination leads to an exponential list 
+ * of constructors. Instead of using numerous constructors, the builder pattern uses 
+ * another object, a builder, that receives each initialization parameter step by step 
+ * and then returns the resulting constructed object at once.
+ * <p>
+ * The Builder pattern has another benefit. It can be used for objects that contain 
+ * flat data (html code, SQL query, X.509 certificate...), that is to say, data that 
+ * can't be easily edited. This type of data cannot be edited step by step and must 
+ * be edited at once. The best way to construct such an object is to use a builder 
+ * class.
+ * <p>
+ * In this example we have the Builder pattern variation as described by Joshua Bloch in
  * Effective Java 2nd Edition.
  * <p>
  * We want to build {@link Hero} objects, but its construction is complex because of the