doc: improve the doc of the 'information' event

- Add missing argument
- Reword a sentence
- Rename the `res` argument to `info` in the example to avoid confusion

PR-URL: https://github.com/nodejs/node/pull/27009
Fixes: https://github.com/nodejs/node/issues/26905


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>