lib: update executionAsyncId/triggerAsyncId comment

This commit updates the comment referring to the
executionAsyncId/triggerAsyncId pair being stored in a std::stack.

It looks like this was changed from std::stack to AliasedFloat64Array in
Commit 83e5215a ("async_hooks: use
typed array stack as fast path").

PR-URL: https://github.com/nodejs/node/pull/33396


Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>