Merge pull request #122477 from SataQiu/fix-20231225

kubeadm: print supported shell types in error message for 'kubeadm completion'

cmd/kubeadm/app/cmd/completion.go

@@ -122,7 +122,7 @@ func RunCompletion(out io.Writer, boilerPlate string, cmd *cobra.Command, args [
 	}
 	run, found := completionShells[args[0]]
 	if !found {
-		return errors.Errorf("unsupported shell type %q", args[0])
+		return errors.Errorf("unsupported shell type %q, the supported shell types are %v", args[0], GetSupportedShells())
 	}
 
 	if len(boilerPlate) == 0 {