Merge pull request #53676 from bergerhoffer/OSDOCS-4083-storage

OSDOCS-4083: Adding new entries for types migrated to CSI

Author: bergerhoffer

migrating_from_ocp_3_to_4/planning-migration-3-4.adoc

@@ -127,7 +127,9 @@ For more information, see xref:../storage/understanding-persistent-storage.adoc#
 
 {product-title} 4 is migrating in-tree volume plug-ins to their Container Storage Interface (CSI) counterparts. In {product-title} {product-version}, CSI drivers are the new default for the following in-tree volume types:
 
+* Amazon Web Services (AWS) Elastic Block Storage (EBS)
 * Azure Disk
+* Google Cloud Platform Persistent Disk (GCP PD)
 * OpenStack Cinder
 
 All aspects of volume lifecycle, such as creation, deletion, mounting, and unmounting, is handled by the CSI driver.