Javadoc fixes

Change-Id: Id23ed2d576b2222194153be9d043ca5acafe67ae
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/TrafficMonitor.java b/web/gui/src/main/java/org/onosproject/ui/impl/TrafficMonitor.java
index 4dcaeb1..3d733f9 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/TrafficMonitor.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/TrafficMonitor.java
@@ -181,6 +181,7 @@
      * </ul>
      *
      * @param mode monitoring mode
+     * @param nodeSelection how to select a node
      */
     public synchronized void monitor(Mode mode, NodeSelection nodeSelection) {
         log.debug("monitor: {} -- {}", mode, nodeSelection);