minor update

Author: JialinXin

articles/azure-web-pubsub/howto-develop-eventhandler.md

@@ -10,7 +10,7 @@ ms.date: 10/31/2021
 
 # Event handler in Azure Web PubSub service
 
-The event handler handles the incoming client events. Event handlers are registered and configured in the service through portal or Azure CLI beforehand so that when a client event is triggered, the service can identify if the event is expected to be handled or not. For public preview, we use `PUSH` mode to invoke the event handler: that the event handler as the server side, exposes public accessible endpoint for the service to invoke when the event is triggered. It acts as a **webhook**. 
+The event handler handles the incoming client events. Event handlers are registered and configured in the service through portal or Azure CLI beforehand so that when a client event is triggered, the service can identify if the event is expected to be handled or not. We now support the event handler as the server side, which exposes public accessible endpoint for the service to invoke when the event is triggered. In other words, it acts as a **webhook**. 
 
 Service delivers client events to the upstream webhook using the [CloudEvents HTTP protocol](https://github.com/cloudevents/spec/blob/v1.0.1/http-protocol-binding.md).