Documentation: ABI: debugfs-driver-qat: fix fw_counters path

The debugfs description for fw_counters reports an incorrect path
indicating a qat folder that does not exist. Fix it.

Fixes: 865b50fe ("crypto: qat - add fw_counters debugfs file")
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/ABI/testing/debugfs-driver-qat

-What:		/sys/kernel/debug/qat_<device>_<BDF>/qat/fw_counters
+What:		/sys/kernel/debug/qat_<device>_<BDF>/fw_counters
 Date:		November 2023
 KernelVersion:	6.6
 Contact:	qat-linux@intel.com