This fixes the description for the U.S. NACHA payment module so its purpose is clearer in Odoo. The change helps users better understand the module when reviewing or installing payment-related features.

This update clarifies that the NACHA payment file feature is intended only for use in the United States. This helps businesses avoid confusion and prevents attempts to use the module for non-US payment processes.

Closes #16044

Co-authored-by: Fabrice Henrion <fhe@odoo.com>