Fix grammatical mistake in Javadoc

Change-Id: I7fe4df6badd8fcc1ad47141468f48eda22fad0f0
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 06788cb..0aa4827 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
@@ -14,7 +14,7 @@
 
     /**
      * Registers the resources in transactional way.
-     * Resource registration is must be done before resource allocation. The state after completion
+     * Resource registration must be done before resource allocation. The state after completion
      * of this method is all the resources are registered, or none of the given resources is registered.
      * The whole registration fails when any one of the resource can't be registered.
      *