Remove statx-specific members from os.stat_result documentation

These members were removed from os.stat_result in a previous commit.

Author: jbosboom

Doc/library/os.rst

@@ -3235,6 +3235,9 @@ features:
       :exc:`AttributeError`.
 
       .. versionadded:: 3.12
+      .. versionchanged:: next
+         ``st_birthtime`` is now available on Linux kernel 4.11 and later when
+         supported by the filesystem.
 
    .. note::
 
@@ -3276,34 +3279,6 @@ features:
 
       User defined flags for file.
 
-   .. attribute:: st_attributes
-
-      Linux file attributes.
-      See the :const:`!STATX_ATTR* <stat.STATX_ATTR_COMPRESSED>`
-      constants in the :mod:`stat` module.
-
-      .. versionadded:: next
-
-   .. attribute:: st_attributes_mask
-
-      Linux file attributes supported by the filesystem containing the file.
-
-      .. versionadded:: next
-
-   .. attribute:: st_mnt_id
-
-      Mount ID of the mount containing the file, corresponding to the first
-      field in ``/proc/self/mountinfo``.
-
-      .. versionadded:: next
-
-   .. attribute:: st_subvol
-
-      ID for the subvolume containing the file, or None if the filesystem does
-      not support subvolumes.
-
-      .. versionadded:: next
-
    On other Unix systems (such as FreeBSD), the following attributes may be
    available (but may be only filled out if root tries to use them):
 
@@ -3396,9 +3371,8 @@ features:
       Added the :attr:`st_birthtime` member on Windows.
 
    .. versionchanged:: next
-      Added the :attr:`st_birthtime`, :attr:`st_attributes`,
-      :attr:`st_attributes_mask`, :attr:`st_mnt_id`, and :attr:`st_subvol`
-      members on Linux.
+      Added the :attr:`st_birthtime` and :attr:`st_birthtime_ns` members on
+      Linux.
 
 
 .. function:: statvfs(path)