doc: revise CHANGELOG.md text

Make the text shorter and clearer.

PR-URL: https://github.com/nodejs/node/pull/23988


Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>