Merge pull request #2857 from ClickHouse/pjhampton/beta-note

Add beta note to iam auth for clickpipes

Author: pjhampton

docs/en/integrations/data-ingestion/clickpipes/kafka.md

@@ -180,6 +180,10 @@ For Apache Kafka protocol data sources, ClickPipes supports [SASL/PLAIN](https:/
 
 ### IAM
 
+:::info
+IAM Authentication for the MSK ClickPipe is a beta feature.
+:::
+
 ClickPipes supports the following AWS MSK authentication
 
   - [SASL/SCRAM-SHA-512](https://docs.aws.amazon.com/msk/latest/developerguide/msk-password.html) authentication