validators: Clean up lakeformation error message

aws/validators.go

@@ -687,7 +687,7 @@ func validatePrincipal(v interface{}, k string) (ws []string, errors []error) {
 
 	pattern := `:(role|user|group|ou|organization)/`
 	if !regexp.MustCompile(pattern).MatchString(value) {
-		errors = append(errors, fmt.Errorf("%q doesn't look like a user or role or group or ou or organization: %q", k, value))
+		errors = append(errors, fmt.Errorf("%q does not look like a user, role, group, OU, or organization: %q", k, value))
 	}
 
 	if len(errors) > 0 {