doc: remove confusing and outdated sentence

Remove confusing and outdated sentence in `doc/api/stream.md`.

Fixes: #55987
PR-URL: #55988
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Jason Zhang <xzha4350@gmail.com>
Reviewed-By: LiviaMedeiros <livia@cirno.name>
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>

Author: lpinca

doc/api/stream.md

@@ -3846,8 +3846,6 @@ added: v8.0.0
 
 The `_destroy()` method is called by [`writable.destroy()`][writable-destroy].
 It can be overridden by child classes but it **must not** be called directly.
-Furthermore, the `callback` should not be mixed with async/await
-once it is executed when a promise is resolved.
 
 #### `writable._final(callback)`