some typo and comments

Command/Command.php

@@ -8,7 +8,7 @@ namespace DesignPatterns\Command;
  * Purpose: To encapsulate invocation and decoupling
  * 
  * We have an Invoker and a Receiver. This pattern use a "Command" to delegate the
- * method call against the Receiver and use the same method "execute".
+ * method call against the Receiver and presents the same method "execute".
  * Therefore, the Invoker just know to call "execute" to process the Command of
  * the client. The Receiver is decoupled from the Invoker
  * 
@@ -28,7 +28,7 @@ interface Command
 
     /**
      * this is the most important method in the Command pattern,
-     * The Receiver go in the constructor.
+     * The Receiver goes in the constructor.
      */
     public function execute();
 }