adding whatsnew notice for bug 22332

Author: realead

doc/source/whatsnew/v0.24.0.txt

@@ -656,6 +656,7 @@ Indexing
 - Fixed ``DataFrame[np.nan]`` when columns are non-unique (:issue:`21428`)
 - Bug when indexing :class:`DatetimeIndex` with nanosecond resolution dates and timezones (:issue:`11679`)
 - Bug where indexing with a Numpy array containing negative values would mutate the indexer (:issue:`21867`)
+- :class:`Index` no longer mangles None, NaN and NaT (:issue:`22332`)
 
 Missing
 ^^^^^^^