Fix javadoc warnings

Change-Id: Ic1f2552f1a91779ee8b2a976ebe316981e6897df
diff --git a/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java b/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java
index 7eca492..010d7e7 100644
--- a/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java
+++ b/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java
@@ -105,6 +105,7 @@
      * @param flowRule the flow rule to transform into a flow mod
      * @param factory the OpenFlow factory to use to build the flow mod
      * @param xid the transaction ID
+     * @param driverService the device driver service
      * @return the new flow mod builder
      */
     public static FlowModBuilder builder(FlowRule flowRule,
@@ -127,6 +128,7 @@
      *
      * @param flowRule the flow rule to transform into a flow mod
      * @param factory the OpenFlow factory to use to build the flow mod
+     * @param driverService the device driver service
      * @param xid the transaction ID
      */
     protected FlowModBuilder(FlowRule flowRule, OFFactory factory, Optional<Long> xid,