doc: fix JS flavor selection
An example of broken behaviour can be found in https://nodejs.org/api/wasi.html#wasi_webassembly_system_interface_wasi. When selecting CJS, both ESM and CJS code are visible.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
An example of broken behaviour can be found in https://nodejs.org/api/wasi.html#wasi_webassembly_system_interface_wasi. When selecting CJS, both ESM and CJS code are visible.