remove release title

I usually add the release title / number when actually doing the release.

docs/releases.rst

@@ -17,12 +17,10 @@ See also :ref:`api_stability`.
 
 `git main <https://github.com/meejah/txtorcon>`_ *will likely become v23.1.0*
 
-v23.1.0
--------
-
 * ``twisted.web.client.Agent`` instances now use the same HTTPS policy by default as ``twisted.web.client.Agent``.
   It is possible to override this policy with the ``tls_context_factory`` argument, the equivalent to ``Agent``'s ``contextFactory=``.
 
+
 v23.0.0
 -------