Unicode documentation references non-existent C function

[pamelafox]

Documentation

The C Unicode reference for PyUnicode_AsWideCharString says "Returns a buffer allocated by PyMem_Alloc()". However, a function named PyMem_Alloc does not currently exist. The function used instead is PyMem_NEW which is a macro for PyMem_New.

I'll send a PR with a fix.

[kamilturek]

Probably can be closed via #94088.

[pamelafox]

Yep, closing, thanks!