Fix javadoc warnings

Change-Id: Ic1f2552f1a91779ee8b2a976ebe316981e6897df
diff --git a/apps/pim/src/main/java/org/onosproject/pim/impl/PIMInterface.java b/apps/pim/src/main/java/org/onosproject/pim/impl/PIMInterface.java
index 28d1e8b..5da5c2b 100644
--- a/apps/pim/src/main/java/org/onosproject/pim/impl/PIMInterface.java
+++ b/apps/pim/src/main/java/org/onosproject/pim/impl/PIMInterface.java
@@ -65,6 +65,8 @@
 
     /**
      * Create a PIMInterface.
+     *
+     * @param intf the network interface configuration
      */
     public PIMInterface(Interface intf) {