Fix javadoc warnings

Change-Id: I3de24a04593f47c786f698f5ee1669b3d2f2fdfc
diff --git a/protocols/bgp/ctl/src/main/java/org/onosproject/bgp/controller/impl/BgpSelectionAlgo.java b/protocols/bgp/ctl/src/main/java/org/onosproject/bgp/controller/impl/BgpSelectionAlgo.java
index d3065f4..d8f6751 100644
--- a/protocols/bgp/ctl/src/main/java/org/onosproject/bgp/controller/impl/BgpSelectionAlgo.java
+++ b/protocols/bgp/ctl/src/main/java/org/onosproject/bgp/controller/impl/BgpSelectionAlgo.java
@@ -108,7 +108,7 @@
      *
      * @param obj1Size object1 AS count
      * @param obj2Size object2 AS count
-     * @return
+     * @return object with shortest AsPath
      */
     int compareAsPath(Integer obj1Size, Integer obj2Size) {
             return obj1Size.compareTo(obj2Size);