Follow the convention for Javadoc

Change-Id: I32742fdeafaa08171915883c6d6fdc0373db9efa
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java
index bf81cfa..5830457 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java
@@ -65,6 +65,7 @@
 
     /**
      * Obtain this filtering type.
+     *
      * @return the type
      */
     Type type();
@@ -99,18 +100,21 @@
 
         /**
          * Permit this filtering condition set.
+         *
          * @return a filtering builder
          */
         Builder permit();
 
         /**
          * Deny this filtering condition set.
+         *
          * @return a filtering builder
          */
         Builder deny();
 
         /**
          * Assigns an application id.
+         *
          * @param appId an application id
          * @return a filtering builder
          */