Issue #21875: Remove vestigial references to Classic Mac OS in os module docs.

diff --cc Doc/library/os.rst
index 7575b3d25887689d698412225abe0c69a7d63aa1,36dfc89146352927c82b27b3a7e77f61679de2ab..9752fb3d1c235701fa68e15b81b9130c326694e0
--- 1/Doc/library/os.rst
--- 2/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@@ -1899,17 -1891,6 +1899,11 @@@ features
     * :attr:`st_gen` - file generation number
     * :attr:`st_birthtime` - time of file creation
  
-    On Mac OS systems, the following attributes may also be available:
- 
-    * :attr:`st_rsize`
-    * :attr:`st_creator`
-    * :attr:`st_type`
- 
 +   On Windows systems, the following attribute is also available:
 +
 +   * :attr:`st_file_attributes` - Windows file attribute bits (see the
 +     ``FILE_ATTRIBUTE_*`` constants in the :mod:`stat` module)
 +
     .. note::
  
        The exact meaning and resolution of the :attr:`st_atime`,