Added missing javadoc.

#story[1095]

racevisionGame/src/main/java/network/Messages/JoinAcceptance.java

@@ -27,6 +27,7 @@ public class JoinAcceptance extends AC35Data {
     /**
      * Constructs a JoinAcceptance message of a given acceptance type.
      * @param acceptanceType The type of join acceptance this is.
+     * @param sourceID The sourceID to assign to the client. 0 indicates no sourceID.
      */
     public JoinAcceptance(JoinAcceptanceEnum acceptanceType, int sourceID){
         super(MessageType.JOIN_ACCEPTANCE);