xml.dom.minidom docs: fix typo (GH-93437)

(cherry picked from commit 639e351)

Co-authored-by: Jean-Christophe Helary <[email protected]>

Author: miss-islington

Doc/library/xml.dom.minidom.rst

@@ -95,7 +95,7 @@ document: the one that holds all others.  Here is an example program::
 When you are finished with a DOM tree, you may optionally call the
 :meth:`unlink` method to encourage early cleanup of the now-unneeded
 objects.  :meth:`unlink` is an :mod:`xml.dom.minidom`\ -specific
-extension to the DOM API that renders the node and its descendants are
+extension to the DOM API that renders the node and its descendants
 essentially useless.  Otherwise, Python's garbage collector will
 eventually take care of the objects in the tree.