gh-90092: Fix :meth: reference target in whatsnew

The bare window.use reference could not resolve in whatsnew (no
currentmodule), causing a docs CI warning; qualify it to
curses.window.use while keeping window.use() as the displayed text.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: serhiy-storchaka

Doc/whatsnew/3.16.rst

@@ -93,7 +93,7 @@ curses
   the new functions :func:`curses.newterm`, :func:`curses.set_term`
   and :func:`curses.new_prescr`,
   the corresponding :ref:`screen <curses-screen-objects>` object,
-  and the :meth:`window.use` method.
+  and the :meth:`window.use() <curses.window.use>` method.
   (Contributed by Serhiy Storchaka in :gh:`90092`.)
 
 * The :mod:`curses` character-cell window methods now accept a full character