doc: fix link in `process.md`
E.g. the link in https://nodejs.org/api/process.html#event-beforeexit leads to process.exit() documentation instead of the process.exitCode one.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
E.g. the link in https://nodejs.org/api/process.html#event-beforeexit leads to process.exit() documentation instead of the process.exitCode one.