doc: improve description of TZ

- Simplify the beginning of the description.
- Add a missing serial comma.
- Add a missing parenthesis.

PR-URL: #43334
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/cli.md

@@ -1960,9 +1960,9 @@ changes:
 
 The `TZ` environment variable is used to specify the timezone configuration.
 
-While the Node.js support for `TZ` will not handle all of the various
-[ways that `TZ` is handled in other environments][], it will support basic
-[timezone IDs][] (such as `'Etc/UTC'`, `'Europe/Paris'` or `'America/New_York'`.
+While Node.js does not support all of the various [ways that `TZ` is handled in
+other environments][], it does support basic [timezone IDs][] (such as
+`'Etc/UTC'`, `'Europe/Paris'`, or `'America/New_York'`).
 It may support a few other abbreviations or aliases, but these are strongly
 discouraged and not guaranteed.