Update custom-domains-using.md

Author: AmberAlston

docs/vendor/custom-domains-using.md

@@ -10,8 +10,6 @@ For more information about custom domains, see [About Custom Domains](custom-dom
 
 If you use a custom domain for the Replicated Enterprise Portal and any of your customers use link transformers such as Microsoft Defender Safe Links, then there is a known issue where legitimate URLs in emails generated by the Enterprise Portal can break due to rewrapping. To avoid this issue, request a "Do not rewrite the following URLs" exclusion policy for your custom Enterprise Portal domain.
 
-For more information, see [About the Enterprise Portal](enterprise-portal-about).
-
 ## Add a Custom Domain in the Vendor Portal {#add-domain}
 
 To add and verify a custom domain: