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gh-89867: string.Formatter auto numbering doc updates (GH-129617)

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Doc/library/string.rst
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@ -131,16 +131,18 @@ implementation as the built-in :meth:`~str.format` method.
(which can happen if two replacement fields occur consecutively), then
*literal_text* will be a zero-length string. If there is no replacement
field, then the values of *field_name*, *format_spec* and *conversion*
will be ``None``.
will be ``None``. The value of *field_name* is unmodified and
auto-numbering of non-numbered positional fields is done by :meth:`vformat`.
.. method:: get_field(field_name, args, kwargs)
Given *field_name* as returned by :meth:`parse` (see above), convert it to
an object to be formatted. Returns a tuple (obj, used_key). The default
version takes strings of the form defined in :pep:`3101`, such as
"0[name]" or "label.title". *args* and *kwargs* are as passed in to
:meth:`vformat`. The return value *used_key* has the same meaning as the
*key* parameter to :meth:`get_value`.
Given *field_name*, convert it to an object to be formatted.
Auto-numbering of *field_name* returned from :meth:`parse` is done by
:meth:`vformat` before calling this method. Returns a tuple (obj, used_key).
The default version takes strings of the form defined in :pep:`3101`,
such as "0[name]" or "label.title". *args* and *kwargs* are as passed in to
:meth:`vformat`. The return value *used_key* has the same meaning
as the *key* parameter to :meth:`get_value`.
.. method:: get_value(key, args, kwargs)