Move the What's New entry to 3.16.

Author: serhiy-storchaka

Doc/whatsnew/3.15.rst

@@ -1830,17 +1830,6 @@ xml
   (Contributed by Serhiy Storchaka in :gh:`139489`.)
 
 
-xml.etree.ElementTree
----------------------
-
-* Add the *validate* option to functions
-  :func:`~xml.etree.ElementTree.tostring`,
-  :func:`~xml.etree.ElementTree.tostringlist`, and the
-  :meth:`Element.write <xml.etree.ElementTree.ElementTree.write>` method,
-  which allows to validate the element or element tree before serialization.
-  (Contributed by Serhiy Storchaka in :gh:`xxxxxx`.)
-
-
 xml.parsers.expat
 -----------------
 

Doc/whatsnew/3.16.rst

@@ -209,6 +209,16 @@ tarfile
 * The undocumented and unused :attr:`!tarfile.TarFile.tarfile` attribute
   has been deprecated since Python 3.13.
 
+xml.etree.ElementTree
+---------------------
+
+* Add the *validate* option to functions
+  :func:`~xml.etree.ElementTree.tostring`,
+  :func:`~xml.etree.ElementTree.tostringlist`, and the
+  :meth:`Element.write <xml.etree.ElementTree.ElementTree.write>` method,
+  which allows to validate the element or element tree before serialization.
+  (Contributed by Serhiy Storchaka in :gh:`149468`.)
+
 .. Add removals above alphabetically, not here at the end.