doc: correct ESM load hook table header

`resolve` does not return a `source` property

PR-URL: https://github.com/nodejs/node/pull/40234


Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>