OSDOCS-10407 clarified cluster creation SQ

Author: xJustin

modules/rosa-required-aws-service-quotas.adoc

@@ -8,7 +8,7 @@
 
 The table below describes the AWS service quotas and levels required to create and run one {product-title} cluster. Although most default values are suitable for most workloads, you might need to request additional quota for the following cases:
 
-* ROSA clusters require at least 100 vCPUs, but the default maximum value for vCPUs assigned to Running On-Demand Standard Amazon EC2 instances is `5`. Therefore if you have not created a ROSA cluster using the same AWS account previously, you must request additional EC2 quota for `Running On-Demand Standard (A, C, D, H, I, M, R, T, Z) instances`.
+* ROSA (classic architecture) clusters require a minimum AWS EC2 service quota of 100 vCPUs to provide for cluster creation, availability, and upgrades. The default maximum value for vCPUs assigned to Running On-Demand Standard Amazon EC2 instances is `5`. Therefore if you have not created a ROSA cluster using the same AWS account previously, you must request additional EC2 quota for `Running On-Demand Standard (A, C, D, H, I, M, R, T, Z) instances`.
 
 * Some optional cluster configuration features, such as custom security groups, might require you to request additional quota. For example, because ROSA associates 1 security group with network interfaces in worker machine pools by default, and the default quota for `Security groups per network interface` is `5`, if you want to add 5 custom security groups, you must request additional quota, because this would bring the total number of security groups on worker network interfaces to 6.