Document signal retention behavior of AbortSignal.any() - #45353
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Description
Adds a Description section to the
AbortSignal.any()reference page documenting that the returned signal stays linked to (and retained by) the input signals until one of them aborts or all become unreachable, with a minimal example of the problematic pattern (repeatedly combining a long-lived signal with short-lived ones) and how to avoid it (abort the short-lived controller when its operation completes).Motivation
Fixes #44695 — the scope follows the discussion in that issue: focused on
AbortSignal.any()only, per the reporter's suggested note and the maintainer's confirmation that the addition is reasonable.