[Java] Update Javadoc.

aeron-agent/src/main/java/io/aeron/agent/DriverEventCode.java

@@ -217,6 +217,9 @@ public enum DriverEventCode implements EventCode
      */
     CMD_IN_REMOVE_DESTINATION_BY_ID(56, DriverEventDissector::dissectCommand),
 
+    /**
+     * Reject image command received by the driver.
+     */
     CMD_IN_REJECT_IMAGE(56, DriverEventDissector::dissectCommand);
 
     static final int EVENT_CODE_TYPE = EventCodeType.DRIVER.getTypeCode();

aeron-client/src/main/java/io/aeron/PublicationErrorFrameHandler.java

@@ -22,12 +22,10 @@
  */
 public interface PublicationErrorFrameHandler
 {
-    PublicationErrorFrameHandler NO_OP = new PublicationErrorFrameHandler()
-    {
-        public void onPublicationError(final PublicationErrorFrame errorFrame)
-        {
-        }
-    };
+    /**
+     * Default no-op error frame handler.
+     */
+    PublicationErrorFrameHandler NO_OP = errorFrame -> {};
 
     /**
      * Called when an error frame for a publication is received by the local driver and needs to be propagated to the