Fix javadoc warnings

Change-Id: Iff748bf6a5b6653b515059506bb2d4f09d3c9878

@@ -99,6 +99,7 @@ public class ReactiveRoutingConfig extends Config<ApplicationId> {
     /**
      *  Gets of the virtual gateway MAC address.
      *
+     * @return virtual gateway MAC address
      */
     public MacAddress virtualGatewayMacAddress() {
         return MacAddress.valueOf(

@@ -244,6 +244,8 @@ public class FlowsWebResource extends AbstractWebResource {
 
     /**
      * Removes a batch of flow rules.
+     *
+     * @param stream stream for posted JSON
      */
     @DELETE
     @Produces(MediaType.APPLICATION_JSON)