ABI: sysfs-class-rapidio: 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/aa073b[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/ABI/testing/sysfs-class-rapidio

···
 		NOTE: An mport ID is not a RapidIO destination ID assigned to a
 		given local mport device.
 
-What:		/sys/class/rapidio_port/rapidioN/sys_size
+What:		/sys/class/rapidio_port/rapidio<N>/sys_size
 Date:		Apr, 2014
 KernelVersion:	v3.15
 Contact:	Matt Porter <[e-mail]>,
···
 
 		1 = large (16-bit destination ID, max. 65536 devices).
 
-What:		/sys/class/rapidio_port/rapidioN/port_destid
+What:		/sys/class/rapidio_port/rapidio<N>/port_destid
 Date:		Apr, 2014
 KernelVersion:	v3.15
 Contact:	Matt Porter <[e-mail]>,