[3.13] gh-141004: Document PyLong_FromPid and PyLong_AsPid (GH-141028) (GH-141143)

* gh-141004: Document `PyLong_FromPid` and `PyLong_AsPid` (GH-141028)

Co-authored-by: Victor Stinner <[email protected]>
(cherry picked from commit bcc524f)

Author: ZeroIntensity

Doc/c-api/long.rst

@@ -141,6 +141,17 @@ distinguished from a number.  Use :c:func:`PyErr_Occurred` to disambiguate.
    .. versionadded:: 3.13
 
 
+.. c:macro:: PyLong_FromPid(pid)
+
+   Macro for creating a Python integer from a process identifier.
+
+   This can be defined as an alias to :c:func:`PyLong_FromLong` or
+   :c:func:`PyLong_FromLongLong`, depending on the size of the system's
+   PID type.
+
+   .. versionadded:: 3.2
+
+
 .. c:function:: long PyLong_AsLong(PyObject *obj)
 
    .. index::
@@ -369,6 +380,17 @@ distinguished from a number.  Use :c:func:`PyErr_Occurred` to disambiguate.
    Returns ``NULL`` on error.  Use :c:func:`PyErr_Occurred` to disambiguate.
 
 
+.. c:macro:: PyLong_AsPid(pid)
+
+   Macro for converting a Python integer into a process identifier.
+
+   This can be defined as an alias to :c:func:`PyLong_AsLong`,
+   :c:func:`PyLong_FromLongLong`, or :c:func:`PyLong_AsInt`, depending on the
+   size of the system's PID type.
+
+   .. versionadded:: 3.2
+
+
 .. c:function:: Py_ssize_t PyLong_AsNativeBytes(PyObject *pylong, void* buffer, Py_ssize_t n_bytes, int flags)
 
    Copy the Python integer value *pylong* to a native *buffer* of size