Clean up source code of REST API

- Add missing @Produces annotation
- Correct comments
- Restrict variable access level

Change-Id: I7f75650b83651248370e7781b1e8aec7eac2314c
diff --git a/web/api/src/main/java/org/onosproject/rest/resources/MulticastRouteWebResource.java b/web/api/src/main/java/org/onosproject/rest/resources/MulticastRouteWebResource.java
index 2a3cd8d..974b74e 100644
--- a/web/api/src/main/java/org/onosproject/rest/resources/MulticastRouteWebResource.java
+++ b/web/api/src/main/java/org/onosproject/rest/resources/MulticastRouteWebResource.java
@@ -44,7 +44,7 @@
      * Get all multicast routes.
      * Returns array of all known multicast routes.
      *
-     * @return 200 OK
+     * @return 200 OK with array of all known multicast routes
      * @onos.rsModel McastRoutesGet
      */
     @GET