doc, child_process: add esm snippets
This PR adds ESM snippets to the documentation for node:child_process.
In addition to this, some snippets were modified for readability (message instead of m, etc)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This PR adds ESM snippets to the documentation for node:child_process.
In addition to this, some snippets were modified for readability (message instead of m, etc)