docs: arm: generic-counter: Allow creating cross-references for ABI

Now that Documentation/ABI is processed by automarkup, let it
generate cross-references for the corresponding ABI file.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/5faafb98c331e0c99433f36dd72badcc540a1baa.1739254867.git.mchehab+huawei@kernel.org

Author: mchehab

Documentation/driver-api/generic-counter.rst

@@ -467,7 +467,7 @@ Counter sysfs
 Translates counter data to the standard Counter sysfs interface format
 and vice versa.
 
-Please refer to the ``Documentation/ABI/testing/sysfs-bus-counter`` file
+Please refer to the Documentation/ABI/testing/sysfs-bus-counter file
 for a detailed breakdown of the available Generic Counter interface
 sysfs attributes.
 
@@ -483,7 +483,7 @@ Sysfs Interface
 Several sysfs attributes are generated by the Generic Counter interface,
 and reside under the ``/sys/bus/counter/devices/counterX`` directory,
 where ``X`` is to the respective counter device id. Please see
-``Documentation/ABI/testing/sysfs-bus-counter`` for detailed information
+Documentation/ABI/testing/sysfs-bus-counter for detailed information
 on each Generic Counter interface sysfs attribute.
 
 Through these sysfs attributes, programs and scripts may interact with