[docs] [issue26103] Contradiction in definition of "data descriptor" between (dotted lookup behavior/datamodel documentation) and (inspect lib/descriptor how-to)

[Lior Cohen]

Lior Cohen <chnlior at gmail.com> added the comment:

Joining @Serhiy Storchaka last question.
Is the __get__ method existance is a must be a data descriptor?

According to the C implementation in descrobject.h
```
#define PyDescr_IsData(d) (Py_TYPE(d)->tp_descr_set != NULL)
#endif
```
the answer is No.
Does this C code reflect the true definition?

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nosy: +chnlior

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<https://bugs.python.org/issue26103>
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