s3: better error message for refresh_secrets

Co-authored-by: wojas <[email protected]>

backends/s3/s3.go

@@ -118,7 +118,7 @@ func (o Options) Check() error {
 		return fmt.Errorf("s3 storage.options: credentials are required, fill either (access_key and secret_key) or (access_key_filename and secret_key_filename)")
 	}
 	if hasSecretsCreds && o.SecretsRefreshInterval < time.Second {
-		return fmt.Errorf("s3 storage.options: field refresh_secrets is required when using secret credentials")
+		return fmt.Errorf("s3 storage.options: field secrets_refresh_interval must be at least 1s")
 	}
 	if o.Bucket == "" {
 		return fmt.Errorf("s3 storage.options: bucket is required")