pythonGH-95815: Document less specific error for os.remove

os.remove can raise PermissionError instead of IsADirectoryError,
when the object to be removed is a directory (in particular on
macOS).

This reverts a change done in python#14262.

Doc/library/os.rst

@@ -2421,7 +2421,7 @@ features:
 .. function:: remove(path, *, dir_fd=None)
 
  Remove (delete) the file *path*. If *path* is a directory, an
- :exc:`IsADirectoryError` is raised. Use :func:`rmdir` to remove directories.
+ :exc:`OSError` is raised. Use :func:`rmdir` to remove directories.
  If the file does not exist, a :exc:`FileNotFoundError` is raised.
 
  This function can support :ref:`paths relative to directory descriptors