Fix 'occured' -> 'occurred' typos in 3 files (#1939)

- activemq-ra/.../SimpleConnectionManager.java: four user-visible LOG.warn
  messages emitted from connectionClosed / connectionErrorOccurred.
- activemq-client/.../TransportListener.java: Javadoc on onException().
- activemq-broker/.../JmsConnector.java: @param Javadoc on
  handleConnectionFailure().

No functional changes.

Signed-off-by: Sai Asish Y <say.apm35@gmail.com>

Author: SAY-5

activemq-broker/src/main/java/org/apache/activemq/network/jms/JmsConnector.java

@@ -484,7 +484,7 @@ public boolean isFailed() {
      * during normal bridging operations.
      *
      * @param connection
-     * 		The connection that was in use when the failure occured.
+     * 		The connection that was in use when the failure occurred.
      */
     void handleConnectionFailure(Connection connection) {
 

activemq-client/src/main/java/org/apache/activemq/transport/TransportListener.java

@@ -32,7 +32,7 @@ public interface TransportListener {
      */
     void onCommand(Object command);
     /**
-     * An unrecoverable exception has occured on the transport
+     * An unrecoverable exception has occurred on the transport
      * @param error
      */
     void onException(IOException error);

activemq-ra/src/main/java/org/apache/activemq/ra/SimpleConnectionManager.java

@@ -58,12 +58,12 @@ public void connectionClosed(ConnectionEvent event) {
         try {
             ((ManagedConnection)event.getSource()).cleanup();
         } catch (ResourceException e) {
-            LOG.warn("Error occured during the cleanup of a managed connection: ", e);
+            LOG.warn("Error occurred during the cleanup of a managed connection: ", e);
         }
         try {
             ((ManagedConnection)event.getSource()).destroy();
         } catch (ResourceException e) {
-            LOG.warn("Error occured during the destruction of a managed connection: ", e);
+            LOG.warn("Error occurred during the destruction of a managed connection: ", e);
         }
     }
 
@@ -93,12 +93,12 @@ public void connectionErrorOccurred(ConnectionEvent event) {
         try {
             ((ManagedConnection)event.getSource()).cleanup();
         } catch (ResourceException e) {
-            LOG.warn("Error occured during the cleanup of a managed connection: ", e);
+            LOG.warn("Error occurred during the cleanup of a managed connection: ", e);
         }
         try {
             ((ManagedConnection)event.getSource()).destroy();
         } catch (ResourceException e) {
-            LOG.warn("Error occured during the destruction of a managed connection: ", e);
+            LOG.warn("Error occurred during the destruction of a managed connection: ", e);
         }
     }