[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/library/unicodedata.rst b/Doc/library/unicodedata.rst
index a3a7c96..d7c48c4 100644
--- a/Doc/library/unicodedata.rst
+++ b/Doc/library/unicodedata.rst
@@ -161,7 +161,7 @@
    9
    >>> unicodedata.decimal(u'a')
    Traceback (most recent call last):
-     File "<stdin>", line 1, in ?
+     File "<stdin>", line 1, in <module>
    ValueError: not a decimal
    >>> unicodedata.category(u'A')  # 'L'etter, 'u'ppercase
    'Lu'