doc: improve AsyncLocalStorage introduction

PR-URL: #36946
Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Andrey Pechkurov <apechkurov@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: brillout

doc/api/async_hooks.md

@@ -955,6 +955,11 @@ chains. It allows storing data throughout the lifetime of a web request
 or any other asynchronous duration. It is similar to thread-local storage
 in other languages.
 
+While you can create your own implementation on top of the `async_hooks` module,
+`AsyncLocalStorage` should be preferred as it is a performant and memory safe
+implementation that involves significant optimizations that are non-obvious to
+implement.
+
 The following example uses `AsyncLocalStorage` to build a simple logger
 that assigns IDs to incoming HTTP requests and includes them in messages
 logged within each request.