Backport r66857: make all whatsnew docs accessible.
diff --git a/Doc/contents.rst b/Doc/contents.rst
index fc9ff03..8b99d0e 100644
--- a/Doc/contents.rst
+++ b/Doc/contents.rst
@@ -4,7 +4,7 @@
 
 .. toctree::
 
-   whatsnew/2.6.rst
+   whatsnew/index.rst
    tutorial/index.rst
    using/index.rst
    reference/index.rst