Further improved Java Docs 10 missing todos.

client/src/main/java/ch/zhaw/pm2/multichat/client/ChatWindowController.java

@@ -251,7 +251,7 @@ public class ChatWindowController {
     }
 
     /**
-     * //TODO missing
+     * Starts several new Listener for Connection Handler changes by using several observable properties.
      */
 
     public void startConnectionHandlerListener() {
@@ -285,7 +285,7 @@ public class ChatWindowController {
     }
 
     /**
-     * //TODO
+     *  Starts a new Listener for messages by using the observable Boolean.
      */
     private void messageListener() {
         messages.getChangedProperty().addListener(new ChangeListener<Boolean>() {

client/src/main/java/ch/zhaw/pm2/multichat/client/Message.java

@@ -12,7 +12,7 @@ public class Message {
     /**
      * Constructor of Message. Needs all Information about a Message to save them.
      *
-     * @param type     Message (if it's a message typed by a user), Error or Information (if it is generated automatically, in this case sender and reciever will be null)
+     * @param type     Message (if it's a message typed by a user), Error or Information (if it is generated automatically, in this case sender and receiver will be null)
      * @param sender   The User who has sent the message.
      * @param receiver The User who should receive the message.
      * @param text     The Text of the message.