task: Explanations and grammar fixes for all the GoF patterns (#1791)

* Grammatical fixes to command pattern

* Update bridge pattern readme

* Fixes to builder pattern grammar

* Update chain of responsibility

* Improvements to the composite example

* Fixes to headings

* Minor updates to decorator pattern

* Update facade

* Update factory example

* Update factory method

* Update flyweight

* Interpreter explanation

* Update iterator readme

* Add explanation for mediator pattern

* Grammatical fixes to memento

* Grammar fixes for observer

* Update explanation for the prototype pattern

* Proxy pattern grammar fixes

* Update singleton

* Grammar fixes to state pattern

* Grammar fixes for strategy

* Grammar fixes, template method

* Grammar fixes for visitor

* Fix typo

composite/README.md

@@ -16,15 +16,15 @@ treat individual objects and compositions of objects uniformly.
 
 ## Explanation
 
-Real world example
+Real-world example
 
 > Every sentence is composed of words which are in turn composed of characters. Each of these 
-> objects is printable and they can have something printed before or after them like sentence always 
-> ends with full stop and word always has space before it.
+> objects are printable and they can have something printed before or after them like sentence 
+> always ends with full stop and word always has space before it.
 
 In plain words
 
-> Composite pattern lets clients treat the individual objects in a uniform manner.
+> Composite pattern lets clients uniformly treat the individual objects.
 
 Wikipedia says
 
@@ -154,10 +154,22 @@ public class Messenger {
 And then it can be used as:
 
 ```java
-var orcMessage = new Messenger().messageFromOrcs();
-orcMessage.print(); // Where there is a whip there is a way.
-var elfMessage = new Messenger().messageFromElves();
-elfMessage.print(); // Much wind pours from your mouth.
+var messenger = new Messenger();
+
+LOGGER.info("Message from the orcs: ");
+messenger.messageFromOrcs().print();
+
+LOGGER.info("Message from the elves: ");
+messenger.messageFromElves().print();
+```
+
+The console output:
+
+```
+Message from the orcs: 
+ Where there is a whip there is a way.
+Message from the elves: 
+ Much wind pours from your mouth.
 ```
 
 ## Class diagram
@@ -172,7 +184,7 @@ Use the Composite pattern when
 * You want clients to be able to ignore the difference between compositions of objects and 
 individual objects. Clients will treat all objects in the composite structure uniformly.
 
-## Real world examples
+## Known uses
 
 * [java.awt.Container](http://docs.oracle.com/javase/8/docs/api/java/awt/Container.html) and [java.awt.Component](http://docs.oracle.com/javase/8/docs/api/java/awt/Component.html)
 * [Apache Wicket](https://github.com/apache/wicket) component tree, see [Component](https://github.com/apache/wicket/blob/91e154702ab1ff3481ef6cbb04c6044814b7e130/wicket-core/src/main/java/org/apache/wicket/Component.java) and [MarkupContainer](https://github.com/apache/wicket/blob/b60ec64d0b50a611a9549809c9ab216f0ffa3ae3/wicket-core/src/main/java/org/apache/wicket/MarkupContainer.java)

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

@@ -45,14 +45,13 @@ public class App {
    * @param args command line args
    */
   public static void main(String[] args) {
+
+    var messenger = new Messenger();
+
     LOGGER.info("Message from the orcs: ");
+    messenger.messageFromOrcs().print();
 
-    var orcMessage = new Messenger().messageFromOrcs();
-    orcMessage.print();
-
-    LOGGER.info("\nMessage from the elves: ");
-
-    var elfMessage = new Messenger().messageFromElves();
-    elfMessage.print();
+    LOGGER.info("Message from the elves: ");
+    messenger.messageFromElves().print();
   }
 }

composite/src/main/java/com/iluwatar/composite/Sentence.java

@@ -39,6 +39,6 @@ public class Sentence extends LetterComposite {
 
   @Override
   protected void printThisAfter() {
-    System.out.print(".");
+    System.out.print(".\n");
   }
 }