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>

drivers/staging/autofs/TODO

-- Work to help people to migrate to autofs4.
-- This filesystem will be removed in the 2.6.38 kernel release.
+autofs version 3 is on its way out of the kernel,
+It has been replaced by autofs4 several years ago.
 
-Please send patches to Greg Kroah-Hartman <greg@kroah.com> and
-Cc: H. Peter Anvin <hpa@zytor.com> and Arnd Bergmann <arnd@arndb.de>
+The autofs3 code uses the big kernel lock which
+is getting deprecated.
+
+Users that find autofs3 to work but not autofs4
+should talk to Ian Kent <raven@themaw.net>.