staging: autofs3: get the TODO file right the third time

This is what Arnd wanted the file to say.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ian Kent <raven@themaw.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>