update CSI supports k8s cluster nodes with Ubuntu 22.04 OS installed

Author: kasserater

docs/content/release_notes/supported_os.md

@@ -8,6 +8,7 @@ The following table lists operating systems required for deployment of the IBM®
 | Red Hat® Enterprise Linux® (RHEL) 9.x             |x86<sup>3</sup>|
 | Red Hat Enterprise Linux CoreOS (RHCOS) 4.12-4.15 |x86, IBM Z, IBM Power Systems™<sup>1</sup>|
 | Ubuntu 20.04.x LTS<sup>2</sup>                    |x86|
+| Ubuntu 22.04.x LTS<sup>2</sup>                    |x86|
 
 <sup>1</sup>IBM Power Systems architecture is only supported on Spectrum Virtualize and DS8000 family storage systems.<br/>
 <sup>2</sup>Ubuntu is supported with Kubernetes orchestration platforms only.<br/>