Update create-cluster-portal.md

remove mention of Cassandra 4.1 as preview (it is GA)

Author: TheovanKraay

articles/managed-instance-apache-cassandra/create-cluster-portal.md

@@ -238,7 +238,7 @@ The service allows update to Cassandra YAML configuration on a datacenter via th
 ## Update Cassandra version
 
 > [!IMPORTANT]
-> Cassandra 4.1, 5.0 and Turnkey Version Updates, are in public preview.
+> Cassandra 5.0 and Turnkey Version Updates, are in public preview.
 > These features are provided without a service level agreement, and it's not recommended for production workloads.
 > For more information, see [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/).