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[3.14] gh-141004: Document Py_DTSF_* macros (GH-141310) (GH-141329)

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gh-141004: Document `Py_DTSF_*` macros (GH-141310)
(cherry picked from commit 9b0179fa87)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
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Doc/c-api/conversion.rst
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@ -128,18 +128,28 @@ The following functions provide locale-independent string to number conversions.
must be 0 and is ignored. The ``'r'`` format code specifies the
standard :func:`repr` format.
*flags* can be zero or more of the values ``Py_DTSF_SIGN``,
``Py_DTSF_ADD_DOT_0``, or ``Py_DTSF_ALT``, or-ed together:
*flags* can be zero or more of the following values or-ed together:
* ``Py_DTSF_SIGN`` means to always precede the returned string with a sign
character, even if *val* is non-negative.
.. c:macro:: Py_DTSF_SIGN
* ``Py_DTSF_ADD_DOT_0`` means to ensure that the returned string will not look
like an integer.
Always precede the returned string with a sign
character, even if *val* is non-negative.
* ``Py_DTSF_ALT`` means to apply "alternate" formatting rules. See the
documentation for the :c:func:`PyOS_snprintf` ``'#'`` specifier for
details.
.. c:macro:: Py_DTSF_ADD_DOT_0
Ensure that the returned string will not look like an integer.
.. c:macro:: Py_DTSF_ALT
Apply "alternate" formatting rules.
See the documentation for the :c:func:`PyOS_snprintf` ``'#'`` specifier for
details.
.. c:macro:: Py_DTSF_NO_NEG_0
Negative zero is converted to positive zero.
.. versionadded:: 3.11
If *ptype* is non-``NULL``, then the value it points to will be set to one of
``Py_DTST_FINITE``, ``Py_DTST_INFINITE``, or ``Py_DTST_NAN``, signifying that