[3.12] Fix typo in XMLParser doc (GH-124129) (#124281)

Fix typo in XMLParser doc (GH-124129)
(cherry picked from commit 622368d)

Co-authored-by: Jacob Walls <jacobtylerwalls@gmail.com>

Author: miss-islington

Doc/library/xml.etree.elementtree.rst

@@ -1370,7 +1370,7 @@ XMLParser Objects
 
    .. versionchanged:: 3.8
       Parameters are now :ref:`keyword-only <keyword-only_parameter>`.
-      The *html* argument no longer supported.
+      The *html* argument is no longer supported.
 
 
    .. method:: close()