Issue #19795: Mark up None as literal text.
diff --git a/Doc/library/linecache.rst b/Doc/library/linecache.rst
index ae3de9f..34fcac5 100644
--- a/Doc/library/linecache.rst
+++ b/Doc/library/linecache.rst
@@ -51,7 +51,7 @@
.. function:: lazycache(filename, module_globals)
Capture enough detail about a non-file-based module to permit getting its
- lines later via :func:`getline` even if *module_globals* is None in the later
+ lines later via :func:`getline` even if *module_globals* is ``None`` in the later
call. This avoids doing I/O until a line is actually needed, without having
to carry the module globals around indefinitely.