Removing incorrect Documentation for IMqttClient.publish (#283)

* Removing incorrect Exception documentation from IMqttClient

Signed-off-by: James Sutton <james.sutton@uk.ibm.com>

Author: jpwsutton

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/IMqttClient.java

@@ -817,7 +817,6 @@ public interface IMqttClient { //extends IMqttAsyncClient {
 	 * @param topic  to deliver the message to, for example "finance/stock/ibm".
 	 * @param message to delivery to the server
  	 * @throws MqttPersistenceException when a problem with storing the message
-	 * @throws IllegalArgumentException if value of QoS is not 0, 1 or 2.
 	 * @throws MqttException for other errors encountered while publishing the message.
 	 * For instance client not connected.
 	 */