doc: fix asyncLocalStorage.run() description

The description that store is not available
when asynchronous operation is created within
the callback is not accurate

PR-URL: #40381
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>

doc/api/async_context.md

@@ -223,8 +223,9 @@ added:
 * `...args` {any}
 
 Runs a function synchronously within a context and returns its
-return value. The store is not accessible outside of the callback function or
-the asynchronous operations created within the callback.
+return value. The store is not accessible outside of the callback function.
+The store is accessible to any asynchronous operations created within the
+callback.
 
 The optional `args` are passed to the callback function.
 
@@ -238,6 +239,9 @@ const store = { id: 2 };
 try {
   asyncLocalStorage.run(store, () => {
     asyncLocalStorage.getStore(); // Returns the store object
+    setTimeout(() => {
+      asyncLocalStorage.getStore(); // Returns the store object
+    }, 200);
     throw new Error();
   });
 } catch (e) {