OSDOCS-4861: Added RHEL 9.2-based RHCOS description to planning migra…

…tion architecture section. Added Azure File and VMWare vSphere to list of CSI drivers in planning migration storage section.

OSDOCS-4861: Removing reference to RHEL 8.6

migrating_from_ocp_3_to_4/planning-migration-3-4.adoc

@@ -21,6 +21,8 @@ With {product-title} 3, administrators individually deployed {op-system-base-ful
 
 {product-title} 4 represents a significant change in the way that {product-title} clusters are deployed and managed. {product-title} 4 includes new technologies and functionality, such as Operators, machine sets, and {op-system-first}, which are core to the operation of the cluster. This technology shift enables clusters to self-manage some functions previously performed by administrators. This also ensures platform stability and consistency, and simplifies installation and scaling.
 
+Beginning with {product-title} 4.13, {op-system} now uses {op-system-base-full} 9.2 packages. This enhancement enables the latest fixes and features as well as the latest hardware support and driver updates. For more information about how this upgrade to RHEL 9.2 might affect your options configuration and services as well as driver and container support, see the xref:../release_notes/ocp-4-13-release-notes.adoc#ocp-4-13-rhcos-rhel-9-2-packages[RHCOS now uses RHEL 9.2] in the _OpenShift Container Platform 4.13 release notes_.
+
 For more information, see xref:../architecture/architecture.adoc#architecture[OpenShift Container Platform architecture].
 
 [discrete]
@@ -129,8 +131,15 @@ For more information, see xref:../storage/understanding-persistent-storage.adoc#
 
 * Amazon Web Services (AWS) Elastic Block Storage (EBS)
 * Azure Disk
+* Azure File
 * Google Cloud Platform Persistent Disk (GCP PD)
 * OpenStack Cinder
+* VMware vSphere
++
+[NOTE]
+====
+As of {product-title} 4.13, VMware vSphere is not available by default. However, you can opt into VMware vSphere.
+====
 
 All aspects of volume lifecycle, such as creation, deletion, mounting, and unmounting, is handled by the CSI driver.