Update 15/umbraco-commerce/release-notes/v15.0.0-rc.md

Author: eshanrnh

15/umbraco-commerce/release-notes/v15.0.0-rc.md

@@ -41,7 +41,7 @@ public class MyNotification : NotificationEventHandlerBase<OrderFinalizedNotific
 ```
 
 ### New behavior
-All API's are now asynchronous and thus are suffixed with Async and return a Task<T> result
+All APIs are now asynchronous and thus are suffixed with Async and return a Task<T> result.
 
 ```csharp
 // Fluent API example