docs: fix links in HTTP API Reference page

Fixes #10745

docs/sources/http_api/index.md

@@ -18,12 +18,15 @@ dashboards, creating users and updating data sources.
 ## Supported HTTP APIs:
 
 
-* [Authentication API]({{< relref "auth.md" >}})
-* [Dashboard API]({{< relref "dashboard.md" >}})
-* [Data Source API]({{< relref "data_source.md" >}})
-* [Organisation API]({{< relref "org.md" >}})
-* [User API]({{< relref "user.md" >}})
-* [Admin API]({{< relref "admin.md" >}})
-* [Snapshot API]({{< relref "snapshot.md" >}})
-* [Preferences API]({{< relref "preferences.md" >}})
-* [Other API]({{< relref "other.md" >}})
+* [Authentication API]({{< relref "/http_api/auth.md" >}})
+* [Dashboard API]({{< relref "/http_api/dashboard.md" >}})
+* [Dashboard Versions API]({{< relref "http_api/dashboard_versions.md" >}})
+* [Data Source API]({{< relref "http_api/data_source.md" >}})
+* [Organisation API]({{< relref "http_api/org.md" >}})
+* [Snapshot API]({{< relref "http_api/snapshot.md" >}})
+* [Annotations API]({{< relref "http_api/annotations.md" >}})
+* [Alerting API]({{< relref "http_api/alerting.md" >}})
+* [User API]({{< relref "http_api/user.md" >}})
+* [Admin API]({{< relref "http_api/admin.md" >}})
+* [Preferences API]({{< relref "http_api/preferences.md" >}})
+* [Other API]({{< relref "http_api/other.md" >}})