doc: fix link in async_hooks.md

PR-URL: https://github.com/nodejs/node/pull/13930
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/async_hooks.md

@@ -564,4 +564,4 @@ never be called.
 * Returns {number} the same `triggerAsyncId` that is passed to the `AsyncResource`
 constructor.
 
-[`Hook Callbacks`]: #hook-callbacks
+[`Hook Callbacks`]: #async_hooks_hook_callbacks