tools: add [src] links to async_hooks.html

handle ES2015 Class, contructor, and instance methods

unrelated: update Makefile so that generated HTML is out of date whenever
tools/doc/apilinks.js is updated.

PR-URL: https://github.com/nodejs/node/pull/22656


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>