Update peps/pep-0757.rst

peps/pep-0757.rst

@@ -184,7 +184,7 @@ create a Python :class:`int` object from a digits array.
 
    The caller must initialize the array of digits *digits* and then call
    :c:func:`PyLongWriter_Finish` to get a Python :class:`int`.  Digits must be
-   in the range [``0``; ``(1 << sys.bits_per_digit) - 1``].  Unused digits must
+   in the range [``0``; ``(1 << sys.int_info.bits_per_digit) - 1``].  Unused digits must
    be set to ``0``.
 
    On CPython 3.14, the implementation is a thin wrapper to the private