Update storage size for openshift dedicated on GCP

Author: mletalie

modules/ccs-gcp-provisioned.adoc

@@ -26,12 +26,12 @@ GCP compute instances are required to deploy the control plane and data plane fu
 == Storage
 
 * Infrastructure volumes:
-** 128 GB SSD persistent disk (deleted on instance deletion)
+** 300 GB SSD persistent disk (deleted on instance deletion)
 ** 110 GB  Standard persistent disk (kept on instance deletion)
 * Worker volumes:
-** 128 GB SSD persistent disk  (deleted on instance deletion)
+** 300 GB SSD persistent disk  (deleted on instance deletion)
 * Control plane volumes:
-** 128 GB SSD persistent disk  (deleted on instance deletion)
+** 350 GB SSD persistent disk  (deleted on instance deletion)
 
 [id="gcp-policy-vpc_{context}"]
 == VPC