Move doc to 2.0.0

Author: RogerThomas

doc/source/whatsnew/v1.5.0.rst

@@ -960,7 +960,6 @@ Performance improvements
 - Performance improvement when setting values in a pyarrow backed string array (:issue:`46400`)
 - Performance improvement in :func:`factorize` (:issue:`46109`)
 - Performance improvement in :class:`DataFrame` and :class:`Series` constructors for extension dtype scalars (:issue:`45854`)
-- Performance improvement in :meth:`DataFrame.to_dict` and :meth:`Series.to_dict` when using any non-object dtypes (:issue:`46470`)
 - Performance improvement in :func:`read_excel` when ``nrows`` argument provided (:issue:`32727`)
 - Performance improvement in :meth:`.Styler.to_excel` when applying repeated CSS formats (:issue:`47371`)
 - Performance improvement in :meth:`MultiIndex.is_monotonic_increasing` (:issue:`47458`)

doc/source/whatsnew/v2.0.0.rst

@@ -326,6 +326,7 @@ Performance improvements
 - Performance improvements to :func:`read_sas` (:issue:`47403`, :issue:`47405`, :issue:`47656`, :issue:`48502`)
 - Memory improvement in :meth:`RangeIndex.sort_values` (:issue:`48801`)
 - Performance improvement in :class:`DataFrameGroupBy` and :class:`SeriesGroupBy` when ``by`` is a categorical type and ``sort=False`` (:issue:`48976`)
+- Performance improvement in :meth:`DataFrame.to_dict` and :meth:`Series.to_dict` when using any non-object dtypes (:issue:`46470`)
 
 .. ---------------------------------------------------------------------------
 .. _whatsnew_200.bug_fixes: