add bugfix to whatsnew

Author: louispotok

doc/source/whatsnew/v0.24.0.txt

@@ -295,6 +295,8 @@ Datetimelike
 ^^^^^^^^^^^^
 
 - Fixed bug where two :class:`DateOffset` objects with different ``normalize`` attributes could evaluate as equal (:issue:`21404`)
+- Bug in :class:`Index` with ``datetime64[ns, tz]`` dtype that did not localize integer data correctly (:issue:`20964`)
+- Fixed bug where `describe` method on tz-aware datetimes did not show `first` and `last` result (:issue:`21328`)
 
 Timedelta
 ^^^^^^^^^