bpo-28315: Improve code examples in docs (GH-1372)

Replace
   File "<stdin>", line 1, in ? 
with 
   File "<stdin>", line 1, in <module>
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 6e9e07a..b065d19 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