[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/fpectl.rst b/Doc/library/fpectl.rst
index 8ca671b..d48b820 100644
--- a/Doc/library/fpectl.rst
+++ b/Doc/library/fpectl.rst
@@ -88,7 +88,7 @@
    >>> import math
    >>> math.exp(1000)
    Traceback (most recent call last):
-     File "<stdin>", line 1, in ?
+     File "<stdin>", line 1, in <module>
    FloatingPointError: in math_1