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/contextvars.rst b/Doc/c-api/contextvars.rst
index a7cde7f..38256a3 100644
--- a/Doc/c-api/contextvars.rst
+++ b/Doc/c-api/contextvars.rst
@@ -60,17 +60,17 @@
.. c:function:: int PyContext_CheckExact(PyObject *o)
Return true if *o* is of type :c:data:`PyContext_Type`. *o* must not be
- *NULL*. This function always succeeds.
+ ``NULL``. This function always succeeds.
.. c:function:: int PyContextVar_CheckExact(PyObject *o)
Return true if *o* is of type :c:data:`PyContextVar_Type`. *o* must not be
- *NULL*. This function always succeeds.
+ ``NULL``. This function always succeeds.
.. c:function:: int PyContextToken_CheckExact(PyObject *o)
Return true if *o* is of type :c:data:`PyContextToken_Type`.
- *o* must not be *NULL*. This function always succeeds.
+ *o* must not be ``NULL``. This function always succeeds.
Context object management functions: