[ARM] Kirkwood: Fix explanation of MPP45 for QNAP TS41x

On the QNAP TS-41x, MPP45 is used to show the setting of jumper JP1.
Fix the documentation to explain what the settings really indicate.

Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
1 file changed