bpo-38600: Change the mark up of NULL in the C API documentation. (GH-16950)
Replace all *NULL* with ``NULL``.
diff --git a/Doc/c-api/refcounting.rst b/Doc/c-api/refcounting.rst
index 6b07c87..0df12c6 100644
--- a/Doc/c-api/refcounting.rst
+++ b/Doc/c-api/refcounting.rst
@@ -13,22 +13,22 @@
.. c:function:: void Py_INCREF(PyObject *o)
- Increment the reference count for object *o*. The object must not be *NULL*; if
- you aren't sure that it isn't *NULL*, use :c:func:`Py_XINCREF`.
+ Increment the reference count for object *o*. The object must not be ``NULL``; if
+ you aren't sure that it isn't ``NULL``, use :c:func:`Py_XINCREF`.
.. c:function:: void Py_XINCREF(PyObject *o)
- Increment the reference count for object *o*. The object may be *NULL*, in
+ Increment the reference count for object *o*. The object may be ``NULL``, in
which case the macro has no effect.
.. c:function:: void Py_DECREF(PyObject *o)
- Decrement the reference count for object *o*. The object must not be *NULL*; if
- you aren't sure that it isn't *NULL*, use :c:func:`Py_XDECREF`. If the reference
+ Decrement the reference count for object *o*. The object must not be ``NULL``; if
+ you aren't sure that it isn't ``NULL``, use :c:func:`Py_XDECREF`. If the reference
count reaches zero, the object's type's deallocation function (which must not be
- *NULL*) is invoked.
+ ``NULL``) is invoked.
.. warning::
@@ -44,18 +44,18 @@
.. c:function:: void Py_XDECREF(PyObject *o)
- Decrement the reference count for object *o*. The object may be *NULL*, in
+ Decrement the reference count for object *o*. The object may be ``NULL``, in
which case the macro has no effect; otherwise the effect is the same as for
:c:func:`Py_DECREF`, and the same warning applies.
.. c:function:: void Py_CLEAR(PyObject *o)
- Decrement the reference count for object *o*. The object may be *NULL*, in
+ Decrement the reference count for object *o*. The object may be ``NULL``, in
which case the macro has no effect; otherwise the effect is the same as for
- :c:func:`Py_DECREF`, except that the argument is also set to *NULL*. The warning
+ :c:func:`Py_DECREF`, except that the argument is also set to ``NULL``. The warning
for :c:func:`Py_DECREF` does not apply with respect to the object passed because
- the macro carefully uses a temporary variable and sets the argument to *NULL*
+ the macro carefully uses a temporary variable and sets the argument to ``NULL``
before decrementing its reference count.
It is a good idea to use this macro whenever decrementing the reference