gh-72073: Add Windows case in pathlib.rename (GH-93002)

#72073

https://docs.python.org/3.12/library/pathlib.html#pathlib.Path.rename

Author: slateny

Doc/library/pathlib.rst

@@ -1021,8 +1021,9 @@ call fails (for example because the path doesn't exist).
 
    Rename this file or directory to the given *target*, and return a new Path
    instance pointing to *target*.  On Unix, if *target* exists and is a file,
-   it will be replaced silently if the user has permission.  *target* can be
-   either a string or another path object::
+   it will be replaced silently if the user has permission.
+   On Windows, if *target* exists, :data:`FileExistsError` will be raised.
+   *target* can be either a string or another path object::
 
       >>> p = Path('foo')
       >>> p.open('w').write('some text')