Added supported versions

Author: slaskawi

docs/RELEASE_NOTES_TEMPLATE.md

@@ -2,6 +2,9 @@
 
 > See the internal "Release Note Authoring Guidance" Wiki page for details
 
+Supported Kubernetes versions: `e.g. 1.27-1.29`
+Supported OpenShift versions: `e.g 4.14`
+
 ## Warnings
 
 > Put here anything that user needs to know to use this version. In most cases, this section will be empty and removed.