Documentation sysfs-bus-usb: Correct use of devnum

Correct use of devnum in supports_autosuspend documentation, the sysfs path
contains busnum-port.port.port not busnum-devnum (which is the usb bus device
address).
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/ABI/testing/sysfs-bus-usb

@@ -60,7 +60,7 @@ Users:
 		PowerTOP <power@bughost.org>
 		http://www.lesswatts.org/projects/powertop/
 
-What:		/sys/bus/usb/device/<busnum>-<devnum>...:<config num>-<interface num>/supports_autosuspend
+What:		/sys/bus/usb/devices/<busnum>-<port[.port]>...:<config num>-<interface num>/supports_autosuspend
 Date:		January 2008
 KernelVersion:	2.6.27
 Contact:	Sarah Sharp <sarah.a.sharp@intel.com>