Merge pull request #270193 from vicancy/patch-14

Update tutorial-build-chat.md

Author: prmerger-automator[bot]

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

@@ -417,6 +417,7 @@ import com.azure.messaging.webpubsub.WebPubSubServiceClient;
 import com.azure.messaging.webpubsub.WebPubSubServiceClientBuilder;
 import com.azure.messaging.webpubsub.models.GetClientAccessTokenOptions;
 import com.azure.messaging.webpubsub.models.WebPubSubClientAccessToken;
+import com.azure.messaging.webpubsub.models.WebPubSubContentType;
 import io.javalin.Javalin;
 
 public class App {