ABI: sysfs-bus-pci: 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: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/4ede4ec98e295f054f3e5a6f3f9393b5e3d5d2a7.1631782432.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/ABI/testing/sysfs-bus-pci

@@ -160,7 +160,7 @@ Description:
 		If the underlying VPD has a writable section then the
 		corresponding section of this file will be writable.
 
-What:		/sys/bus/pci/devices/.../virtfnN
+What:		/sys/bus/pci/devices/.../virtfn<N>
 Date:		March 2009
 Contact:	Yu Zhao <yu.zhao@intel.com>
 Description: