Update tutorial-build-chat.md

Author: vicancy

articles/azure-web-pubsub/tutorial-build-chat.md

@@ -609,7 +609,7 @@ ngrok will print a URL (`https://<domain-name>.ngrok.io`) that can be accessed f
 
 ### Set event handler
 
-Then we update the service event handler and set the Webhook URL to ``https://<domain-name>.ngrok.io/eventhandler`. Event handlers can be set from either the portal or the CLI as [described in this article](howto-develop-eventhandler#configure-event-handler), here we set it through CLI.
+Then we update the service event handler and set the Webhook URL to `https://<domain-name>.ngrok.io/eventhandler`. Event handlers can be set from either the portal or the CLI as [described in this article](howto-develop-eventhandler.md#configure-event-handler), here we set it through CLI.
 
 Use the Azure CLI [az webpubsub hub create](/cli/azure/webpubsub/hub#az_webpubsub_hub_update) command to create the event handler settings for the chat hub