small doc update

Author: jreback

doc/source/whatsnew/v0.21.0.txt

@@ -12,7 +12,7 @@ Highlights include:
 - Integration with `Apache Parquet <https://parquet.apache.org/>`__, including a new top-level :func:`read_parquet` and :func:`DataFrame.to_parquet` method, see :ref:`here <io.parquet>`.
 - New user-facing :class:`pandas.api.types.CategoricalDtype` for specifying
   categoricals independent of the data, see :ref:`here <whatsnew_0210.enhancements.categorical_dtype>`.
-- The behavior of ``sum`` and ``prod`` on all-NaN Series/DataFrames is now consistent without regards to `bottleneck <http://berkeleyanalytics.com/bottleneck>`__ is installed, see :ref:`here <whatsnew_0210.api_breaking.bottleneck>`
+- The behavior of ``sum`` and ``prod`` on all-NaN Series/DataFrames is now consistent and no longer depends on whether `bottleneck <http://berkeleyanalytics.com/bottleneck>`__ is installed, see :ref:`here <whatsnew_0210.api_breaking.bottleneck>`
 
 Check the :ref:`API Changes <whatsnew_0210.api_breaking>` and :ref:`deprecations <whatsnew_0210.deprecations>` before updating.
 
@@ -274,8 +274,8 @@ We have updated our minimum supported versions of dependencies (:issue:`15206`,
 Sum/Prod of all-NaN Series/DataFrames is now consistently NaN
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-The behavior of summing all-NaN Series/DataFrames is now consistent without regards to
-whether `bottleneck <http://berkeleyanalytics.com/bottleneck>`__  is installed. (:issue:`9422`, :issue:`15507`).
+The behavior of ``sum`` and ``prod`` on all-NaN Series/DataFrames is now consistent and no longer depends on
+whether `bottleneck <http://berkeleyanalytics.com/bottleneck>`__ is installed. (:issue:`9422`, :issue:`15507`).
 
 This now will *always* preserve information. You will get back a ``NaN``, indicating missing values in that Series,
 or if summing a ``DataFrame``, a ``Series`` of all-``NaN``.