new whatsnew message

Author: tp

doc/source/whatsnew/v0.23.2.txt

@@ -24,11 +24,9 @@ Fixed Regressions
 Performance Improvements
 ~~~~~~~~~~~~~~~~~~~~~~~~
 
-- Improved performance of membership checks in :class:`CategoricalIndex`
-  (i.e. ``x in ci``-style checks are much faster). :meth:`CategoricalIndex.contains`
-  is likewise much faster (:issue:`21369`)
-- Improved performance of membership checks in :class:`Categorical`
-  (i.e. ``x in categorical``-style checks are much faster) (:issue:`21369`)
+- Improved performance of membership checks in :class:`Categorical` and
+  :class:`CategoricalIndex` (i.e. ``x in cat``-style checks are much faster).
+  :meth:`CategoricalIndex.contains` is likewise much faster (:issue:`21369` & :issue:`21508`)
 -
 
 Documentation Changes