Fix javadoc warnings

Change-Id: I156c861729fd48d5e6792f810c342e1579482c04
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveContext.java b/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveContext.java
index c6db17f..f3d23e4 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveContext.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveContext.java
@@ -39,6 +39,7 @@
      * Invoked when error is encountered while executing the flow objective.
      *
      * @param objective objective to execute
+     * @param error error encountered
      */
     default void onError(Objective objective, ObjectiveError error) {
     }