ABI: sysfs-class-gnss: 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: Johan Hovold <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Link: https://lore.kernel.org/r/80b7f6[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/ABI/testing/sysfs-class-gnss

···
-What:		/sys/class/gnss/gnssN/type
+What:		/sys/class/gnss/gnss<N>/type
 Date:		May 2018
 KernelVersion:	4.18
 Contact:	Johan Hovold <[e-mail]>