Consistency check for versionadded/changed directives.
diff --git a/Doc/c-api/arg.rst b/Doc/c-api/arg.rst
index 72f2d96..f955c96 100644
--- a/Doc/c-api/arg.rst
+++ b/Doc/c-api/arg.rst
@@ -305,13 +305,14 @@
the conversion has failed. When the conversion fails, the *converter* function
should raise an exception and leave the content of *address* unmodified.
- If the *converter* returns Py_CLEANUP_SUPPORTED, it may get called a second time
- if the argument parsing eventually fails, giving the converter a chance to release
- any memory that it had already allocated. In this second call, the *object* parameter
- will be NULL; *address* will have the same value as in the original call.
+ If the *converter* returns ``Py_CLEANUP_SUPPORTED``, it may get called a
+ second time if the argument parsing eventually fails, giving the converter a
+ chance to release any memory that it had already allocated. In this second
+ call, the *object* parameter will be NULL; *address* will have the same value
+ as in the original call.
.. versionchanged:: 3.1
- Py_CLEANUP_SUPPORTED was added.
+ ``Py_CLEANUP_SUPPORTED`` was added.
``(items)`` (:class:`tuple`) [*matching-items*]
The object must be a Python sequence whose length is the number of format units