doc: document iterable input for AbortSignal.any

Describe signals as an iterable of AbortSignals, matching the WebIDL
sequence conversion and the existing iterable test.

Signed-off-by: haramjeong (04harams77@gmail.com)
Assisted-by: Codex

Author: haramj

doc/api/globals.md

@@ -138,7 +138,8 @@ added:
   - v18.17.0
 -->
 
-* `signals` {AbortSignal\[]} The `AbortSignal`s of which to compose a new `AbortSignal`.
+* `signals` {Iterable} An iterable of `AbortSignal`s from which to compose a new
+  `AbortSignal`.
 
 Returns a new `AbortSignal` which will be aborted if any of the provided
 signals are aborted. Its [`abortSignal.reason`][] will be set to whichever