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doc: add parallelism note to os.cpus()
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With the introduction of os.availableParallelism(), users should
no longer rely on os.cpus().length to determine the amount of
available parallelism. This commit adds a note to the os.cpus()
docs.

PR-URL: #45895
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
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cjihrig authored and juanarbol committed Jan 31, 2023
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Expand Up @@ -140,6 +140,10 @@ The properties included on each object include:
`nice` values are POSIX-only. On Windows, the `nice` values of all processors
are always 0.

`os.cpus().length` should not be used to calculate the amount of parallelism
available to an application. Use
[`os.availableParallelism()`](#osavailableparallelism) for this purpose.

## `os.devNull`

<!-- YAML
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