ONOS-2717: Handle duplicate resource unregistration in resource store

Change-Id: I49648be9c26ba66218172d570632d54584a908d8
diff --git a/core/api/src/main/java/org/onosproject/net/newresource/ResourceStore.java b/core/api/src/main/java/org/onosproject/net/newresource/ResourceStore.java
index 0aa4827..fc2eba7 100644
--- a/core/api/src/main/java/org/onosproject/net/newresource/ResourceStore.java
+++ b/core/api/src/main/java/org/onosproject/net/newresource/ResourceStore.java
@@ -26,7 +26,7 @@
     /**
      * Unregisters the resources in transactional way.
      * The state after completion of this method is all the resources are unregistered,
-     * or no resource is unregistered. The whole unregistration fails when any one of the
+     * or none of the given resources is unregistered. The whole unregistration fails when any one of the
      * resource can't be unregistered.
      *
      * @param resources resources to be unregistered