doc: correct cleanup option in stream.(promises.)finished #55043
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Please check my working, but my reading of
stream.finished()andstream.promises.finished()is that:stream.finished()iseos()in internal/streams/end-of-stream, which returns a cleanup function that can be called by the user to remove the event listeners added byfinished()stream.promises.finished()isfinished()in internal/streams/end-of-stream, which accepts the boolean optionoptions.cleanup, which will call the cleanup function returned byeos()before the returned Promise is resolved or rejectedWhen
options.cleanupwas added in #44862, the documentation for it appears to have been added to the callback API function rather than the promises API function.This change moves it to the correct place, and documents the context of its usage, similar to the equivalent documentation for the callback API function.
Refs: #44862