Add credentials inventory to Admin Area index

doc/user/admin_area/index.md

@@ -19,7 +19,7 @@ Only admin users can access the Admin Area.
 The Admin Area is made up of the following sections:
 
 | Section                         | Description                                                                                                                                                                                                                                                                              |
-|:------------------------------|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+|:--------------------------------|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | [Overview](#overview-section)   | View your GitLab [Dashboard](#admin-dashboard), and administer [projects](#administering-projects), [users](#administering-users), [groups](#administering-groups), [jobs](#administering-jobs), [Runners](#administering-runners), and [Gitaly servers](#administering-gitaly-servers). |
 | Monitoring                      | View GitLab [system information](#system-info), and information on [background jobs](#background-jobs), [logs](#logs), [health checks](monitoring/health_check.md), [requests profiles](#requests-profiles), and [audit logs](#audit-log-premium-only).                                  |
 | Messages                        | Send and manage [broadcast messages](broadcast_messages.md) for your users.                                                                                                                                                                                                              |
@@ -30,6 +30,7 @@ The Admin Area is made up of the following sections:
 | Push Rules **(STARTER)**        | Configure pre-defined Git [push rules](../../push_rules/push_rules.md) for projects.                                                                                                                                                                                                     |
 | Geo **(PREMIUM ONLY)**          | Configure and maintain [Geo nodes](geo_nodes.md).                                                                                                                                                                                                                                        |
 | Deploy Keys                     | Create instance-wide [SSH deploy keys](../../ssh/README.md#deploy-keys).                                                                                                                                                                                                                 |
+| Credentials **(ULTIMATE ONLY)** | View [credentials](credentials_inventory.md) that can be used to access your instance.                                                                                                                                                                                                   |
 | Service Templates               | Create [service templates](../project/integrations/services_templates.md) for projects.                                                                                                                                                                                                  |
 | Labels                          | Create and maintain [labels](labels.md) for your GitLab instance.                                                                                                                                                                                                                        |
 | Appearance                      | Customize [GitLab's appearance](appearance.md).                                                                                                                                                                                                                                          |