ABI: sysfs-devices-platform-dock: use wildcards on What definitions

An "N" upper letter is not a wildcard, nor can easily be identified
by script, specially since the USB sysfs define things like.
bNumInterfaces. Use, instead, <N>, in order to let script/get_abi.pl
to convert it into a Regex.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Link: https://lore.kernel.org/r/56790b[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/ABI/testing/sysfs-devices-platform-dock

···
-What:		/sys/devices/platform/dock.N/docked
+What:		/sys/devices/platform/dock.<N>/docked
 Date:		Dec, 2006
 KernelVersion:	2.6.19
 Contact:	[e-mail]
···
 		(RO) Value 1 or 0 indicates whether the software believes the
 		laptop is docked in a docking station.
 
-What:		/sys/devices/platform/dock.N/undock
+What:		/sys/devices/platform/dock.<N>/undock
 Date:		Dec, 2006
 KernelVersion:	2.6.19
 Contact:	[e-mail]
···
 		(WO) Writing to this file causes the software to initiate an
 		undock request to the firmware.
 
-What:		/sys/devices/platform/dock.N/uid
+What:		/sys/devices/platform/dock.<N>/uid
 Date:		Feb, 2007
 KernelVersion:	v2.6.21
 Contact:	[e-mail]
 Description:
 		(RO) Displays the docking station the laptop is docked to.
 
-What:		/sys/devices/platform/dock.N/flags
+What:		/sys/devices/platform/dock.<N>/flags
 Date:		May, 2007
 KernelVersion:	v2.6.21
 Contact:	[e-mail]
···
 		request has been made by the user (from the immediate_undock
 		option).
 
-What:		/sys/devices/platform/dock.N/type
+What:		/sys/devices/platform/dock.<N>/type
 Date:		Aug, 2008
 KernelVersion:	v2.6.27
 Contact:	[e-mail]