fixup! Masking and overflow checks for datetimeindex and timedeltaindex ops (#18020)

Author: TomAugspurger

doc/source/whatsnew/v0.21.1.txt

@@ -85,9 +85,6 @@ Documentation Changes
 
 Bug Fixes
 ~~~~~~~~~
-- Bug in ``DataFrame.resample(...).apply(...)`` when there is a callable that returns different columns (:issue:`15169`)
-- Bug in :class:`TimedeltaIndex` subtraction could incorrectly overflow when ``NaT`` is present (:issue:`17791`)
-- Bug in :class:`DatetimeIndex` subtracting datetimelike from DatetimeIndex could fail to overflow (:issue:`18020`)
 
 Conversion
 ^^^^^^^^^^
@@ -162,8 +159,8 @@ Numeric
 ^^^^^^^
 
 - Bug in ``pd.Series.rolling.skew()`` and ``rolling.kurt()`` with all equal values has floating issue (:issue:`18044`)
--
--
+- Bug in :class:`TimedeltaIndex` subtraction could incorrectly overflow when ``NaT`` is present (:issue:`17791`)
+- Bug in :class:`DatetimeIndex` subtracting datetimelike from DatetimeIndex could fail to overflow (:issue:`18020`)
 -
 
 Categorical