docs edits

Enhances Customer Emails screen with Return-Path configuration details.

Author: paigecalvert

docs/release-notes/rn-vendor-platform.md

@@ -15,7 +15,7 @@ This topic contains release notes for the Replicated Vendor Platform, which incl
 Released on December 16, 2025
 
 ### New Features {#new-features-v2025-12-16-3}
-* Updates Customer Emails screen to include Return-Path configuration and verification alongside DKIM.
+* Adds Return-Path configuration and verification alongside DKIM for Enterprise Portal email sender configuration. For more information, see [Configure Email Sender](/vendor/enterprise-portal-configure#configure-email-sender). in _Customize the Enterprise Portal_.
 
 ## v2025.12.04-1