fix some comments

Author: dbl-x

openmessaging-api/src/main/java/io/openmessaging/api/GenericListener.java

@@ -27,7 +27,7 @@ public interface GenericListener<T> {
     /**
      * Returns the class of the object that the user wants to deserialize the message into.
      *
-     * @return the class of message payload that user desired
+     * @return the class of message payload that user expects
      */
     Class<T> payloadClass();
 }

openmessaging-api/src/main/java/io/openmessaging/api/order/GenericMessageOrderListener.java

@@ -30,7 +30,7 @@
 public interface GenericMessageOrderListener<T> extends GenericListener<T> {
 
     /**
-     * When message arrived, this method will be invoked by order.
+     * When message arrived, this method will be invoked in order.
      *
      * @param message received message
      * @param context