Get rid of the remaining versionadded/versionchanged directives.
diff --git a/Doc/library/constants.rst b/Doc/library/constants.rst
index fecd836..8f7be50 100644
--- a/Doc/library/constants.rst
+++ b/Doc/library/constants.rst
@@ -5,19 +5,17 @@
A small number of constants live in the built-in namespace. They are:
+.. XXX False, True, None are keywords too
+
.. data:: False
The false value of the :class:`bool` type.
- .. versionadded:: 2.3
-
.. data:: True
The true value of the :class:`bool` type.
- .. versionadded:: 2.3
-
.. data:: None