doc: descriptions of signal `0` in section about signal events is confusing

[mscdex]

Version

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Platform

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Subsystem

doc

What steps will reproduce the bug?

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How often does it reproduce? Is there a required condition?

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What is the expected behavior?

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What do you see instead?

https://nodejs.org/docs/v17.7.0/api/process.html#signal-events

The mentions about the special signal 0 are irrelevant because that section is discussing events and 0 is not included because you cannot catch that signal (AFAIK).

That information is better kept in process.kill() (already exists there) because it's about sending a special signal to detect if the process at that pid is alive.

Additional information

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