doc: clarify async caveats for events.once()
#61572
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The current warnings for
events.once()focus heavily onprocess.nextTick().The footgun really appears in any case where sequential
await events.once(...)statements are used, as execution won't resume within the suspended async function until the current call stack has completed, by which point multiple events may have been emitted. This is just as likely to be run into in general execution, rather than withprocess.nextTick()specifically.Refs: #34220