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gh-100315: clarification to __slots__ docs. (GH-102621)

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refer to tp_itemsize in discussion on "variable-length" built-in types
(cherry picked from commit 88c262c086)

Co-authored-by: T <tnie@tuta.io>
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Doc/reference/datamodel.rst
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@ -1944,8 +1944,10 @@ Notes on using *__slots__*
descriptor directly from the base class). This renders the meaning of the
program undefined. In the future, a check may be added to prevent this.
* Nonempty *__slots__* does not work for classes derived from "variable-length"
built-in types such as :class:`int`, :class:`bytes` and :class:`tuple`.
* :exc:`TypeError` will be raised if nonempty *__slots__* are defined for a
class derived from a
:c:member:`"variable-length" built-in type <PyTypeObject.tp_itemsize>` such as
:class:`int`, :class:`bytes`, and :class:`tuple`.
* Any non-string :term:`iterable` may be assigned to *__slots__*.