Follow the convention of javadoc used in the project

Insert a blank line between the brief desciption and paramter description.

Change-Id: Iad27f20aa862f84a4278624f0df75f98ab9e543f
diff --git a/core/api/src/main/java/org/onlab/onos/net/statistic/Load.java b/core/api/src/main/java/org/onlab/onos/net/statistic/Load.java
index 41b4cf9..6422cb3 100644
--- a/core/api/src/main/java/org/onlab/onos/net/statistic/Load.java
+++ b/core/api/src/main/java/org/onlab/onos/net/statistic/Load.java
@@ -22,24 +22,28 @@
 
     /**
      * Obtain the current observed rate (in bytes/s) on a link.
+     *
      * @return long value
      */
     long rate();
 
     /**
      * Obtain the latest bytes counter viewed on that link.
+     *
      * @return long value
      */
     long latest();
 
     /**
      * Indicates whether this load was built on valid values.
+     *
      * @return boolean
      */
     boolean isValid();
 
     /**
      * Returns when this value was seen.
+     *
      * @return epoch time
      */
     long time();