child_process: add env contents types in JSDoc
Use JSDoc to indicate that the env object keys and values must be
strings.
Refs: https://github.com/nodejs/node/pull/42489#discussion_r835867932
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Use JSDoc to indicate that the env object keys and values must be
strings.
Refs: https://github.com/nodejs/node/pull/42489#discussion_r835867932