__text_signature__ for __get__ methods is wrong

[JelleZijlstra]

In [18]: object.__init__.__get__.__text_signature__
Out[18]: '($self, instance, owner, /)'

In [19]: object.__init__.__get__(1)
Out[19]: <method-wrapper '__init__' of int object at 0x105e7d0b0>

In [20]: object.__init__.__get__(1, 2)
Out[20]: <method-wrapper '__init__' of int object at 0x105e7d0b0>

The signature claims there are two required positional arguments, but in fact the second argument is optional.

(Tested on 3.11 but I think it's wrong on all recent versions.)

[ambv]

Fixed. Thanks! ✨ 🍰 ✨