Update change-notifications-delivery-webhooks.md

Updated line 147 for proper grammar

Author: rsfine

concepts/change-notifications-delivery-webhooks.md

@@ -144,7 +144,7 @@ Content-Type: application/json
 
 ---
 
-The **clientState** property is required. Setting it property allows your service to confirm that change notifications you receive originate from Microsoft Graph. For this reason, the value of the property should remain secret and known only to your application and the Microsoft Graph service.
+The **clientState** property is required. Setting the **clientState** property allows your service to confirm that change notifications you receive originate from Microsoft Graph. For this reason, the value of the property should remain secret and known only to your application and the Microsoft Graph service.
 
 If successful, Microsoft Graph returns a `201 Created` code and a [subscription](/graph/api/resources/subscription) object in the body.