[DOC] Add feature toggle for admin page (#88954)

Co-authored-by: Jack Baldry <jack.baldry@grafana.com>

docs/sources/administration/feature-toggles/index.md

@@ -50,6 +50,8 @@ To edit a feature toggle, follow these steps:
 1. Navigate to the list of feature toggles and select your feature state overrides.
 1. Click **Save changes** and wait for your Grafana instance to restart with the updated feature toggles.
 
-{{% admonition type="note" %}}
+{{< admonition type="note" >}}
+If you don't have the feature toggle management page, enable the `featureToggleAdminPage` feature toggle.
+
 Editing feature toggles with the feature toggle management page is available now in all tiers of [Grafana Cloud](/docs/grafana-cloud/).
-{{% /admonition %}}
+{{< /admonition >}}