docs(admin): remove incorrect Advanced tab reference for Configuration Active

The checkbox is at the top of the LDAP config form, not under the Advanced tab.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

Author: skjnldsv

admin_manual/configuration_user/user_auth_ldap.rst

@@ -631,10 +631,9 @@ Testing the configuration
 -------------------------
 
 .. warning:: Before testing, make sure the **Configuration Active** checkbox is
-   enabled under the **Advanced** tab. It is disabled by default and will cause
-   authentication to fail with a "wrong password" error even if all other settings
-   are correct. Nextcloud only enables it automatically after a successful test
-   connection.
+   enabled. It is disabled by default and will cause authentication to fail with
+   a "wrong password" error even if all other settings are correct. Nextcloud
+   only enables it automatically after a successful test connection.
 
 The **Test Configuration** button checks the values as currently given in the
 input fields. You do not need to save before testing. By clicking on the