doc: correct esm spec scope lookup definition

PR-URL: https://github.com/nodejs/node/pull/40592
Fixes: https://github.com/nodejs/node/issues/40578


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>