async_hooks: remove deprecated example

PR-URL: #20998
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Backport-PR-URL: #21172

Author: mafintosh

doc/api/async_hooks.md

@@ -615,14 +615,6 @@ asyncResource.asyncId();
 
 // Return the trigger ID for the AsyncResource instance.
 asyncResource.triggerAsyncId();
-
-// Call AsyncHooks before callbacks.
-// Deprecated: Use asyncResource.runInAsyncScope instead.
-asyncResource.emitBefore();
-
-// Call AsyncHooks after callbacks.
-// Deprecated: Use asyncResource.runInAsyncScope instead.
-asyncResource.emitAfter();
 ```
 
 #### new AsyncResource(type[, options])