[2.7] bpo-28315: Improve code examples in docs (GH-1372) (#1447)

Replace
   File "<stdin>", line 1, in ?
with
   File "<stdin>", line 1, in <module>.
(cherry picked from commit 8856940cf2e82cb17db2b684cd5732fe658605ca)
diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst
index e1ac89f..a264bd7 100644
--- a/Doc/tutorial/controlflow.rst
+++ b/Doc/tutorial/controlflow.rst
@@ -444,7 +444,7 @@
    ...
    >>> function(0, a=0)
    Traceback (most recent call last):
-     File "<stdin>", line 1, in ?
+     File "<stdin>", line 1, in <module>
    TypeError: function() got multiple values for keyword argument 'a'
 
 When a final formal parameter of the form ``**name`` is present, it receives a