Update 4.18 release note. Please include a link to the KCS article that provides instructions to enable storage class migration.

References: 

• To enable the required feature gates, follow the workaround documented in Enable storage live migration in OpenShift Virtualization 4.17 in the Red Hat knowledge base.
• https://access.redhat.com/solutions/7089972
• https://docs.redhat.com/en/documentation/openshift_container_platform/4.17/html-single/virtualization/index#virt-4-16-technology-preview_virt-4-17-release-notes