detect unexpected args on flux check command

Signed-off-by: Kenny Meador <kenny.meador@outlook.com>

cmd/flux/check.go

@@ -40,6 +40,7 @@ import (
 
 var checkCmd = &cobra.Command{
 	Use:   "check",
+	Args:  cobra.NoArgs,
 	Short: "Check requirements and installation",
 	Long: withPreviewNote(`The check command will perform a series of checks to validate that
 the local environment is configured correctly and if the installed components are healthy.`),