docs: update delegation

delegation/README.md

@@ -3,7 +3,9 @@ title: Delegation
 category: Behavioral
 language: en
 tag:
+    - Decoupling
     - Delegation
+    - Object composition
 ---
 
 ## Also known as
@@ -13,7 +15,7 @@ tag:
 
 ## Intent
 
-The Delegation pattern in Java allows an object to delegate one or more tasks to a helper object. It is a technique where an object expresses certain behavior but actually delegates responsibility for implementing that behavior to an associated helper object.
+To allow an object to delegate responsibility for a task to another helper object.
 
 ## Explanation
 
@@ -27,6 +29,8 @@ Wikipedia says
 
 **Programmatic Example**
 
+Let's consider a printing example.
+
 We have an interface `Printer` and three implementations `CanonPrinter`, `EpsonPrinter` and `HpPrinter`.
 
 ```java
@@ -59,8 +63,7 @@ public class HpPrinter implements Printer {
 }
 ```
 
-The `PrinterController` can be used as a `Printer` by delegating any work handled by this
-interface to an object implementing it.
+The `PrinterController` can be used as a `Printer` by delegating any work handled by this interface to an object implementing it.
 
 ```java
 public class PrinterController implements Printer {
@@ -78,8 +81,7 @@ public class PrinterController implements Printer {
 }
 ```
 
-Now on the client code printer controllers can print messages differently depending on the
-object they're delegating that work to.
+Now on the client code printer controllers can print messages differently depending on the object they're delegating that work to.
 
 ```java
 public class App {