doc: fix backticks around 'default'
Refs: https://github.com/nodejs/node/pull/41569 Co-authored-by: @VoltrexMaster
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Refs: https://github.com/nodejs/node/pull/41569 Co-authored-by: @VoltrexMaster