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[3.14] gh-141004: Document Py_MATH_{E, PI, TAU} constants (GH-141373) (#141471)

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gh-141004: Document `Py_MATH_{E, PI, TAU}` constants (GH-141373)
(cherry picked from commit f1330b35b8)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
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@ -96,16 +96,33 @@ Floating-Point Objects
the C11 standard ``<math.h>`` header.
.. c:macro:: Py_MATH_E
The definition (accurate for a :c:expr:`double` type) of the :data:`math.e` constant.
.. c:macro:: Py_MATH_El
High precision (long double) definition of :data:`~math.e` constant.
.. c:macro:: Py_MATH_PI
The definition (accurate for a :c:expr:`double` type) of the :data:`math.pi` constant.
.. c:macro:: Py_MATH_PIl
High precision (long double) definition of :data:`~math.pi` constant.
.. c:macro:: Py_MATH_TAU
The definition (accurate for a :c:expr:`double` type) of the :data:`math.tau` constant.
.. versionadded:: 3.6
.. c:macro:: Py_RETURN_NAN
Return :data:`math.nan` from a function.