Update node.js/outbox.md

Co-authored-by: René Jeglinsky <[email protected]>

node.js/outbox.md

@@ -31,7 +31,7 @@ await outboxed.send('someEvent', { some: 'message' }) // asynchronous
 ```
 
 ::: tip
-You still need to `await` these operations, because messages might be stored in a database first, inside your main transaction.
+You still need to `await` these operations. Then the messages are stored in the database, together with the main transaction.
 :::
 
 The `cds.outboxed` function can also be called with optional configuration options.