Merge pull request #93496 from fmcdonal/OSDOCS-14051

OSDOCS-14051: Update the documentation with details of Storage volumes configured by default.

Author: EricPonvelle

modules/rosa-sts-overview-of-the-default-cluster-specifications.adoc

@@ -154,6 +154,15 @@ ifndef::tf-classic,tf-hcp[]
 * Default Operator role prefix: `<cluster_name>-<4_digit_random_string>`
 endif::tf-classic,tf-hcp[]
 
+|Storage
+|* Node volumes:
+** Type: AWS EBS GP3
+** Default size: 300GiB (adjustable at creation time)
+* Workload persistent volumes:
+** Default StorageClass: gp3-csi
+** Provisioner: ebs.csi.aws.com
+** Dynamic persistent volume provisioning
+
 |Cluster update strategy
 |* Individual updates
 * 1 hour grace period for node draining