[issue39500] Document PyUnicode_IsIdentifier() function

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Other examples are:

* PyObject_HasAttr
* PyObject_HasAttrString
* PyMapping_HasKey
* PyMapping_HasKeyString

They are bad examples, but can't be changed for backward compatibility. I wonder whether PyUnicode_IsIdentifier should also kept unchanged for backward compatibility.

There is also a number of *_Check functions which always succeeds.

Other example is _PyUnicode_EqualToASCIIString where the behavior is intentional.

PyUnicode_IsIdentifier() was not documented before. It makes easier to change its behavior.

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