doc: simplify async_hooks overview

Explain the purpose of async_hooks simply in the overview.

PR-URL: #31660
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/async_hooks.md

@@ -4,9 +4,8 @@
 
 > Stability: 1 - Experimental
 
-The `async_hooks` module provides an API to register callbacks tracking the
-lifetime of asynchronous resources created inside a Node.js application.
-It can be accessed using:
+The `async_hooks` module provides an API to track asynchronous resources. It
+can be accessed using:
 
 ```js
 const async_hooks = require('async_hooks');