Update v1.3.0.rst

whatsnew entry

Author: jackzyliu

doc/source/whatsnew/v1.3.0.rst

@@ -1198,6 +1198,7 @@ Other
 - Bug in :class:`Series` backed by :class:`DatetimeArray` or :class:`TimedeltaArray` sometimes failing to set the array's ``freq`` to ``None`` (:issue:`41425`)
 - Bug in creating a :class:`Series` from a ``range`` object that does not fit in the bounds of ``int64`` dtype (:issue:`30173`)
 - Bug in creating a :class:`Series` from a ``dict`` with all-tuple keys and an :class:`Index` that requires reindexing (:issue:`41707`)
+- Bug in :meth:`_CustomBusinessMonth.apply` not applying extra offset when initially rolled date `new` is already a business day (:issue:`41356`)
 
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