[3.6] bpo-28315: Improve code examples in docs (GH-1372) (#1445)

Replace
   File "<stdin>", line 1, in ?
with
   File "<stdin>", line 1, in <module>
(cherry picked from commit 8856940cf2e82cb17db2b684cd5732fe658605ca)
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index c4f6c55..43d2690 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -905,7 +905,7 @@
    2 1
    >>> f(a=1, *(2,))
    Traceback (most recent call last):
-     File "<stdin>", line 1, in ?
+     File "<stdin>", line 1, in <module>
    TypeError: f() got multiple values for keyword argument 'a'
    >>> f(1, *(2,))
    1 2