Merge pull request #301901 from craigshoemaker/patch-14

[Web PubSub] Update: socket-io-serverless-tutorial -> add connection string include

Author: prmerger-automator[bot]

articles/azure-web-pubsub/socket-io-serverless-tutorial.md

@@ -20,6 +20,8 @@ Find full code samples that are used in this tutorial:
 > [!IMPORTANT]
 > Default Mode needs a persistent server, you cannot integration Web PubSub for Socket.IO in default mode with Azure Function.
 
+[!INCLUDE [Connection string security](includes/web-pubsub-connection-string-security.md)]
+
 ## Prerequisites
 
 > [!div class="checklist"]