[3.12] gh-117945: Fix os.path.ismount() documentation (GH-117947) (#117952)

gh-117945: Fix `os.path.ismount()` documentation (GH-117947)
(cherry picked from commit a23fa33)

Co-authored-by: Nice Zombies <[email protected]>

Author: miss-islington

Doc/library/os.path.rst

@@ -295,8 +295,8 @@ the :mod:`glob` module.)
    always mount points, and for any other path ``GetVolumePathName`` is called
    to see if it is different from the input path.
 
-   .. versionadded:: 3.4
-      Support for detecting non-root mount points on Windows.
+   .. versionchanged:: 3.4
+      Added support for detecting non-root mount points on Windows.
 
    .. versionchanged:: 3.6
       Accepts a :term:`path-like object`.