Accept the suggestion by mroeschke

Rephrase the what's new addition

Co-authored-by: Matthew Roeschke <[email protected]>

Author: taranarmo

doc/source/whatsnew/v3.0.0.rst

@@ -559,7 +559,7 @@ MultiIndex
 I/O
 ^^^
 - Bug in :class:`DataFrame` and :class:`Series` ``repr`` of :py:class:`collections.abc.Mapping`` elements. (:issue:`57915`)
-- Bug in :meth:`.DataFrame.to_json` was producing corrupted record (data incompatible with schema) if 'index' was the name of a column and index.name was empty (which is replaced with generic 'index' internally), now it will fail on check if index.name is in columns (:issue:`58925`)
+- Bug in :meth:`.DataFrame.to_json` when ``"index"`` was a value in the :attr:`DataFrame.column` and :attr:`Index.name` was ``None``. Now, this will fail with a ``ValueError`` (:issue:`58925`)
 - 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_stata` when writing :class:`DataFrame` and ``byteorder=`big```. (:issue:`58969`)