gh-117194: Properly format 'base64' header in What's New (#117198)

It needs 6, not 3, '-'s.

diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst
index c9a93d58056747424aa3ea9a3021596208cbe643..aba672dcb3f4563676490fd13a0e58e22c4ee304 100644 (file)
--- a/Doc/whatsnew/3.13.rst
+++ b/Doc/whatsnew/3.13.rst
@@ -284,7 +284,7 @@ asyncio
   (Contributed by Pierre Ossman in :gh:`113538`.)
 
 base64
----
+------
 
 * Add :func:`base64.z85encode` and :func:`base64.z85decode` functions which allow encoding
   and decoding z85 data.