doc: fix example description for worker_threads

PR-URL: nodejs#41341
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Harshitha K P <harshitha014@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>

doc/api/worker_threads.md

@@ -47,7 +47,7 @@ if (isMainThread) {
 }
 ```
 
-The above example spawns a Worker thread for each `parse()` call. In actual
+The above example spawns a Worker thread for each `parseJSAsync()` call. In
 practice, use a pool of Workers for these kinds of tasks. Otherwise, the
 overhead of creating Workers would likely exceed their benefit.