Update network-rules.md

this service has nothing to do with Azure SQL

Author: TheovanKraay

articles/managed-instance-apache-cassandra/network-rules.md

@@ -11,7 +11,7 @@ ms.custom: ignite-fall-2021
 
 # Required outbound network rules
 
-The Azure SQL Managed Instance for Apache Casandra service requires certain network rules to properly manage the service. By ensuring you have the proper rules exposed, you can keep your service secure and prevent operational issues.
+The Azure Managed Instance for Apache Cassandra service requires certain network rules to properly manage the service. By ensuring you have the proper rules exposed, you can keep your service secure and prevent operational issues.
 
 > [!WARNING]
 > We recommend exercising caution when applying changes to firewall rules for an existing cluster. For example, if rules are not applied correctly, they might not be applied to existing connections, so it may appear that firewall changes have not caused any problems. However, automatic updates of the Cassandra Managed Instance nodes may subsequently fail. We recommend monitoring connectivity after any major firewall updates for some time to ensure there are no issues.