Split the monstrous C API manual files in smaller parts.
diff --git a/Doc/c-api/none.rst b/Doc/c-api/none.rst
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+.. highlightlang:: c
+
+.. _noneobject:
+
+The None Object
+---------------
+
+.. index:: object: None
+
+Note that the :ctype:`PyTypeObject` for ``None`` is not directly exposed in the
+Python/C API. Since ``None`` is a singleton, testing for object identity (using
+``==`` in C) is sufficient. There is no :cfunc:`PyNone_Check` function for the
+same reason.
+
+
+.. cvar:: PyObject* Py_None
+
+ The Python ``None`` object, denoting lack of value. This object has no methods.
+ It needs to be treated just like any other object with respect to reference
+ counts.
+
+
+.. cmacro:: Py_RETURN_NONE
+
+ Properly handle returning :cdata:`Py_None` from within a C function.
+
+ .. versionadded:: 2.4
+