Moved changelog msg to 3.0.0 and adapted phrasing

Author: Jesse

doc/source/whatsnew/v2.3.0.rst

@@ -150,7 +150,6 @@ MultiIndex
 I/O
 ^^^
 - :meth:`DataFrame.to_excel` was storing decimals as strings instead of numbers (:issue:`49598`)
-- :meth:`DataFrame.to_stata` no longer throws a ``TypeError('encoding without a string argument')`` when exporting a column containing both long strings (Stata strL) and :class:`pd.NA` values (:issue:`23633`)
 -
 
 Period

doc/source/whatsnew/v3.0.0.rst

@@ -733,6 +733,7 @@ I/O
 - Bug in :meth:`DataFrame.to_dict` raises unnecessary ``UserWarning`` when columns are not unique and ``orient='tight'``. (:issue:`58281`)
 - Bug in :meth:`DataFrame.to_excel` when writing empty :class:`DataFrame` with :class:`MultiIndex` on both axes (:issue:`57696`)
 - Bug in :meth:`DataFrame.to_excel` where the :class:`MultiIndex` index with a period level was not a date (:issue:`60099`)
+- Bug in :meth:`DataFrame.to_stata` when exporting a column containing both long strings (Stata strL) and :class:`pd.NA` values (:issue:`23633`)
 - Bug in :meth:`DataFrame.to_stata` when writing :class:`DataFrame` and ``byteorder=`big```. (:issue:`58969`)
 - Bug in :meth:`DataFrame.to_stata` when writing more than 32,000 value labels. (:issue:`60107`)
 - Bug in :meth:`DataFrame.to_string` that raised ``StopIteration`` with nested DataFrames. (:issue:`16098`)