Fix punctuation.
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index bb392fc..7579cc9 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1047,8 +1047,8 @@
but some features (such as :func:`len`) will raise :exc:`OverflowError`.
.. versionchanged:: 3.2
- Implement the Sequence ABC
- Support slicing and negative indices
+ Implement the Sequence ABC.
+ Support slicing and negative indices.
Test integers for membership in constant time instead of iterating
through all items.