Subtle error in `getattr_hook` example in the Descriptor Guide

Documentation

The example below, from the Descriptor Guide, does not seem to reflect the behaviour of the actual implementation.

https://github.com/python/cpython/blob/ced2691de4c9500ac9a5ccded00741a5fc2d9d2c/Doc/howto/descriptor.rst?plain=1#L733-L740

Unless I'm mistaken, line 736 return obj.__getattribute__(name) should actually read return type(obj).__getattribute__(obj, name).

It's easy to miss when thinking of class instances, but the issue becomes more evident when the example is applied to an attribute lookup on a class object instead. The example would call the __getattribute__ method of the class itself, while the actual implementation calls __getattribute__ on the metaclass (not to mention that in this case the call in the example would fail, due to a missing argument, as it is calling a plain function, rather than a bound method).

打开 Doc/howto/descriptor.rst 的第 733-740 行附近，将 getattr_hook 示例与 issue 中描述的实现行为进行比较，尤其要关注类对象属性查找。如果确认存在差异，请更新文档中的返回表达式，并验证指南与实现一致。