Fix Javadoc warnings

Change-Id: Icf8b6b6f77ea80d3975aa975226a178145067adf
diff --git a/core/api/src/main/java/org/onosproject/net/driver/BehaviourClassResolver.java b/core/api/src/main/java/org/onosproject/net/driver/BehaviourClassResolver.java
index a5474f0..b49e439 100644
--- a/core/api/src/main/java/org/onosproject/net/driver/BehaviourClassResolver.java
+++ b/core/api/src/main/java/org/onosproject/net/driver/BehaviourClassResolver.java
@@ -24,7 +24,7 @@
     /**
      * Returns the class corresponding to the specified class name.
      * @param className class className
-     * @return
+     * @return class for the resolver
      */
     Class<? extends Behaviour> getBehaviourClass(String className);