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/cell.rst b/Doc/c-api/cell.rst
index 8514afe..8408f7e 100644
--- a/Doc/c-api/cell.rst
+++ b/Doc/c-api/cell.rst
@@ -27,13 +27,13 @@
.. c:function:: int PyCell_Check(ob)
- Return true if *ob* is a cell object; *ob* must not be *NULL*.
+ Return true if *ob* is a cell object; *ob* must not be ``NULL``.
.. c:function:: PyObject* PyCell_New(PyObject *ob)
Create and return a new cell object containing the value *ob*. The parameter may
- be *NULL*.
+ be ``NULL``.
.. c:function:: PyObject* PyCell_Get(PyObject *cell)
@@ -44,19 +44,19 @@
.. c:function:: PyObject* PyCell_GET(PyObject *cell)
Return the contents of the cell *cell*, but without checking that *cell* is
- non-*NULL* and a cell object.
+ non-``NULL`` and a cell object.
.. c:function:: int PyCell_Set(PyObject *cell, PyObject *value)
Set the contents of the cell object *cell* to *value*. This releases the
- reference to any current content of the cell. *value* may be *NULL*. *cell*
- must be non-*NULL*; if it is not a cell object, ``-1`` will be returned. On
+ reference to any current content of the cell. *value* may be ``NULL``. *cell*
+ must be non-``NULL``; if it is not a cell object, ``-1`` will be returned. On
success, ``0`` will be returned.
.. c:function:: void PyCell_SET(PyObject *cell, PyObject *value)
Sets the value of the cell object *cell* to *value*. No reference counts are
- adjusted, and no checks are made for safety; *cell* must be non-*NULL* and must
+ adjusted, and no checks are made for safety; *cell* must be non-``NULL`` and must
be a cell object.