Issue #19795: Mark up None as literal text.
diff --git a/Doc/library/doctest.rst b/Doc/library/doctest.rst
index 66a521e..131206d 100644
--- a/Doc/library/doctest.rst
+++ b/Doc/library/doctest.rst
@@ -1215,7 +1215,7 @@
.. attribute:: docstring
- The string that the test was extracted from, or 'None' if the string is
+ The string that the test was extracted from, or ``None`` if the string is
unavailable, or if the test was not extracted from a string.
@@ -1320,7 +1320,7 @@
not specified, then ``obj.__name__`` is used.
The optional parameter *module* is the module that contains the given object.
- If the module is not specified or is None, then the test finder will attempt
+ If the module is not specified or is ``None``, then the test finder will attempt
to automatically determine the correct module. The object's module is used:
* As a default namespace, if *globs* is not specified.