docs: add changeline to v3.0.0.rst

Author: suzyahyah

doc/source/whatsnew/v3.0.0.rst

@@ -1081,6 +1081,7 @@ Groupby/resample/rolling
 - Bug in :meth:`Rolling.apply` for ``method="table"`` where column order was not being respected due to the columns getting sorted by default. (:issue:`59666`)
 - Bug in :meth:`Rolling.apply` where the applied function could be called on fewer than ``min_period`` periods if ``method="table"``. (:issue:`58868`)
 - Bug in :meth:`Series.resample` could raise when the date range ended shortly before a non-existent time. (:issue:`58380`)
+- Bug in :meth:`Series.rolling.var` and :meth:`Series.rolling.std` where the end of window was not indexed correctly. (:issue:`47721`, :issue:`52407`, :issue:`54518`, :issue:`55343`)
 
 Reshaping
 ^^^^^^^^^