Fix shutil.which() test for issue #16993.
diff --git a/Doc/library/shutil.rst b/Doc/library/shutil.rst
index b5f39fe..a1457d0 100644
--- a/Doc/library/shutil.rst
+++ b/Doc/library/shutil.rst
@@ -335,7 +335,7 @@
    directories.  For example, on Windows::
 
       >>> shutil.which("python")
-      'C:\\Python33\\python.exe'
+      'C:\\Python33\\python.EXE'
 
    .. versionadded:: 3.3