add Attributes Reference to docs

Author: vojindj

website/docs/r/ip_filters_settings.md

@@ -34,6 +34,10 @@ This example enables the IP filtering feature.
 
 * `ip_filtering_enabled` - (Required) Specifies whether the IP filtering feature is enabled.
 
+## Attributes Reference
+
+No additional attributes are exported.
+
 ## Import
 
 Sysdig IP filters settings can be imported, e.g.