[docs] [issue22748] Porting Extension Modules to Python 3 documentation mention about PyString_* functions in Python 3

[Roundup Robot]

Roundup Robot added the comment:

New changeset 18f346abdfbe by Georg Brandl in branch '2.7':
Closes #22748: there are no PyString C functions in 3.x.
https://hg.python.org/cpython/rev/18f346abdfbe

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<http://bugs.python.org/issue22748>
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