indicate we use ignition 2.2.0 & note groups unsupported
@@ -24,12 +24,13 @@ If the updated Ignition config contains changes compatible with the current conf
Not all Ignition config sections are supported; see the following table:
-Ignition sections | Supported
+Ignition 2.2.0 sections | Supported
--- | ---
Files | YES
systemd Units | YES
Networkd | NO
Users | NO *
+Groups | NO
Directories | NO
FileSystems | NO
Links | NO
