fix: remove misleading reference to User Defined setting for Business subscribers

The User Defined option is not valid for Business tier subscribers in the
Admin Console. Replace the parenthetical with a generic warning to not leave
the setting at its default value.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Claude Docs Agent

content/manuals/ai/gordon/_index.md

@@ -50,8 +50,8 @@ Before you begin:
 > 2. Once confirmed, an organization administrator must set **Enable Gordon** to
 >    **Enabled** or **Always Enabled** in the
 >    [Admin Console](/manuals/enterprise/security/hardened-desktop/settings-management/configure-admin-console.md).
->    Setting it to **User Defined** (which delegates the decision to individual
->    users) will not activate Gordon organization-wide.
+>    Do not leave the setting at its default value, as this will not activate
+>    Gordon organization-wide.
 
 ### Quick start