ABI: sysfs-ptp: 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.

Acked-by: Richard Cochran <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Link: https://lore.kernel.org/r/03dcf9[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/ABI/testing/sysfs-ptp

···
 		providing a standardized interface to the ancillary
 		features of PTP hardware clocks.
 
-What:		/sys/class/ptp/ptpN/
+What:		/sys/class/ptp/ptp<N>/
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
···
 		hardware clock registered into the PTP class driver
 		subsystem.
 
-What:		/sys/class/ptp/ptpN/clock_name
+What:		/sys/class/ptp/ptp<N>/clock_name
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
···
 		MAC based ones. The string does not necessarily have
 		to be any kind of unique id.
 
-What:		/sys/class/ptp/ptpN/max_adjustment
+What:		/sys/class/ptp/ptp<N>/max_adjustment
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
···
 		frequency adjustment value (a positive integer) in
 		parts per billion.
 
-What:		/sys/class/ptp/ptpN/max_vclocks
+What:		/sys/class/ptp/ptp<N>/max_vclocks
 Date:		May 2021
 Contact:	Yangbo Lu <[e-mail]>
 Description:
 		This file contains the maximum number of ptp vclocks.
 		Write integer to re-configure it.
 
-What:		/sys/class/ptp/ptpN/n_alarms
+What:		/sys/class/ptp/ptp<N>/n_alarms
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
 		This file contains the number of periodic or one shot
 		alarms offer by the PTP hardware clock.
 
-What:		/sys/class/ptp/ptpN/n_external_timestamps
+What:		/sys/class/ptp/ptp<N>/n_external_timestamps
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
 		This file contains the number of external timestamp
 		channels offered by the PTP hardware clock.
 
-What:		/sys/class/ptp/ptpN/n_periodic_outputs
+What:		/sys/class/ptp/ptp<N>/n_periodic_outputs
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
 		This file contains the number of programmable periodic
 		output channels offered by the PTP hardware clock.
 
-What:		/sys/class/ptp/ptpN/n_pins
+What:		/sys/class/ptp/ptp<N>/n_pins
 Date:		March 2014
 Contact:	Richard Cochran <[e-mail]>
 Description:
 		This file contains the number of programmable pins
 		offered by the PTP hardware clock.
 
-What:		/sys/class/ptp/ptpN/n_vclocks
+What:		/sys/class/ptp/ptp<N>/n_vclocks
 Date:		May 2021
 Contact:	Yangbo Lu <[e-mail]>
 Description:
···
 		switches the physical clock back to normal, adjustable
 		operation.
 
-What:		/sys/class/ptp/ptpN/pins
+What:		/sys/class/ptp/ptp<N>/pins
 Date:		March 2014
 Contact:	Richard Cochran <[e-mail]>
 Description:
···
 		assignment may be changed by two writing numbers into
 		the file.
 
-What:		/sys/class/ptp/ptpN/pps_available
+What:		/sys/class/ptp/ptp<N>/pps_available
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
···
 		"1" means that the PPS is supported, while "0" means
 		not supported.
 
-What:		/sys/class/ptp/ptpN/extts_enable
+What:		/sys/class/ptp/ptp<N>/extts_enable
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
···
 		To disable external timestamps, write the channel
 		index followed by a "0" into the file.
 
-What:		/sys/class/ptp/ptpN/fifo
+What:		/sys/class/ptp/ptp<N>/fifo
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
···
 		the form of three integers: channel index, seconds,
 		and nanoseconds.
 
-What:		/sys/class/ptp/ptpN/period
+What:		/sys/class/ptp/ptp<N>/period
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description:
···
 		period nanoseconds. To disable a periodic output, set
 		all the seconds and nanoseconds values to zero.
 
-What:		/sys/class/ptp/ptpN/pps_enable
+What:		/sys/class/ptp/ptp<N>/pps_enable
 Date:		September 2010
 Contact:	Richard Cochran <[e-mail]>
 Description: