update docs

Author: auderson

doc/source/whatsnew/v1.5.0.rst

@@ -96,7 +96,8 @@ Other enhancements
 - :meth:`pd.concat` now raises when ``levels`` contains duplicate values (:issue:`46653`)
 - Added ``numeric_only`` argument to :meth:`DataFrame.corr`, :meth:`DataFrame.corrwith`, and :meth:`DataFrame.cov` (:issue:`46560`)
 - :meth:`DataFrame.rolling.var`, :meth:`DataFrame.rolling.std`, :meth:`Series.rolling.var`, :meth:`Series.rolling.std` now generate correct result 0 for window containing same values (:issue:`42064`)
--
+- :meth:`DataFrame.rolling.skew`, :meth:`Series.rolling.skew` now generate correct result 0 for window containing same values (:issue:`42064`)
+- :meth:`DataFrame.rolling.kurt`, :meth:`Series.rolling.kurt` now generate correct result -3 for window containing same values (:issue:`42064`, :issue:`30993`)
 
 .. ---------------------------------------------------------------------------
 .. _whatsnew_150.notable_bug_fixes: