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document Py_VISIT as a macro in the docs (#133688)

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Doc/c-api/gcsupport.rst
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@ -180,9 +180,9 @@ provided. In order to use this macro, the :c:member:`~PyTypeObject.tp_traverse`
must name its arguments exactly *visit* and *arg*:
.. c:function:: void Py_VISIT(PyObject *o)
.. c:macro:: Py_VISIT(o)
If *o* is not ``NULL``, call the *visit* callback, with arguments *o*
If the :c:expr:`PyObject *` *o* is not ``NULL``, call the *visit* callback, with arguments *o*
and *arg*. If *visit* returns a non-zero value, then return it.
Using this macro, :c:member:`~PyTypeObject.tp_traverse` handlers
look like::