Fix all the old usage of admonition syntax (#107098)

docs/sources/developers/http_api/group_attribute_sync.md

@@ -21,9 +21,9 @@ The Group Attribute Sync API allows you to configure [group attribute sync featu
 
 > **Note:** Available in [Grafana Enterprise](https://grafana.com/docs/grafana/<GRAFANA_VERSION>/introduction/grafana-enterprise) and [Grafana Cloud](https://grafana.com/docs/grafana-cloud/)
 
-{{% admonition type="note" %}}
+{{< admonition type="note" >}}
 This feature is currently in [private preview](https://grafana.com/docs/release-life-cycle/#private-preview) and behind the `groupAttributeSync` feature toggle. Please contact support to have this feature enabled.
-{{% /admonition %}}
+{{< /admonition >}}
 
 ## List group mappings