doc: mark some functions as experimental
The functions node_api_throw_syntax_error and node_api_throw_syntax_error are experimental. This PR provides to mark these functions as experimental in the documentation.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The functions node_api_throw_syntax_error and node_api_throw_syntax_error are experimental. This PR provides to mark these functions as experimental in the documentation.