Doc update for __xslice__ removal.
diff --git a/Doc/library/constants.rst b/Doc/library/constants.rst
index 8f7be50..c36b2fa 100644
--- a/Doc/library/constants.rst
+++ b/Doc/library/constants.rst
@@ -34,7 +34,6 @@
 .. data:: Ellipsis
 
    The same as ``...``. Special value used mostly in conjunction with extended
-   slicing syntax for user-defined container data types.
+   slicing syntax for user-defined container data types, as in ::
 
-   .. % XXX Someone who understands extended slicing should fill in here.
-
+      val = container[1:5, 7:10, ...]