doc: abort controller emits error in child process

Fixes: #46036
PR-URL: #46072
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

doc/api/child_process.md

@@ -1186,9 +1186,10 @@ property is `false`.
 
 The `'error'` event is emitted whenever:
 
-1. The process could not be spawned, or
-2. The process could not be killed, or
-3. Sending a message to the child process failed.
+* The process could not be spawned.
+* The process could not be killed.
+* Sending a message to the child process failed.
+* The child process was aborted via the `signal` option.
 
 The `'exit'` event may or may not fire after an error has occurred. When
 listening to both the `'exit'` and `'error'` events, guard