bpo-38600: NULL -> ``NULL``. (GH-17001)
Also fix some other formatting.
diff --git a/Doc/c-api/function.rst b/Doc/c-api/function.rst
index a3cbf56..bb416f4 100644
--- a/Doc/c-api/function.rst
+++ b/Doc/c-api/function.rst
@@ -42,8 +42,8 @@
.. c:function:: PyObject* PyFunction_NewWithQualName(PyObject *code, PyObject *globals, PyObject *qualname)
As :c:func:`PyFunction_New`, but also allows setting the function object's
- ``__qualname__`` attribute. *qualname* should be a unicode object or NULL;
- if NULL, the ``__qualname__`` attribute is set to the same value as its
+ ``__qualname__`` attribute. *qualname* should be a unicode object or ``NULL``;
+ if ``NULL``, the ``__qualname__`` attribute is set to the same value as its
``__name__`` attribute.
.. versionadded:: 3.3
@@ -75,7 +75,7 @@
.. c:function:: int PyFunction_SetDefaults(PyObject *op, PyObject *defaults)
Set the argument default values for the function object *op*. *defaults* must be
- *Py_None* or a tuple.
+ ``Py_None`` or a tuple.
Raises :exc:`SystemError` and returns ``-1`` on failure.
@@ -89,7 +89,7 @@
.. c:function:: int PyFunction_SetClosure(PyObject *op, PyObject *closure)
Set the closure associated with the function object *op*. *closure* must be
- *Py_None* or a tuple of cell objects.
+ ``Py_None`` or a tuple of cell objects.
Raises :exc:`SystemError` and returns ``-1`` on failure.
@@ -103,6 +103,6 @@
.. c:function:: int PyFunction_SetAnnotations(PyObject *op, PyObject *annotations)
Set the annotations for the function object *op*. *annotations*
- must be a dictionary or *Py_None*.
+ must be a dictionary or ``Py_None``.
Raises :exc:`SystemError` and returns ``-1`` on failure.