Fixed double hyphens that are rendered to literal en-dashes in the documenation.
diff --git a/Doc/library/importlib.rst b/Doc/library/importlib.rst
index c4307b5..f93e945 100644
--- a/Doc/library/importlib.rst
+++ b/Doc/library/importlib.rst
@@ -1,5 +1,5 @@
-:mod:`importlib` -- Convenience wrappers for :func:`__import__`
-===============================================================
+:mod:`importlib` --- Convenience wrappers for :func:`__import__`
+================================================================
.. module:: importlib
:synopsis: Convenience wrappers for __import__