docs: ABI: sysfs-driver-dma-ioatdma: what starts with /sys

This is the only file where the /sys doesn't start with
a /.

So, rename them to:

	sys -> /sys

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/f4c53fff9696a61ff0e144fee237a9527982626d.1604312590.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/ABI/stable/sysfs-driver-dma-ioatdma

@@ -1,29 +1,29 @@
-What:           sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/cap
+What:           /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/cap
 Date:           December 3, 2009
 KernelVersion:  2.6.32
 Contact:        dmaengine@vger.kernel.org
 Description:	Capabilities the DMA supports.Currently there are DMA_PQ, DMA_PQ_VAL,
 		DMA_XOR,DMA_XOR_VAL,DMA_INTERRUPT.
 
-What:           sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_active
+What:           /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_active
 Date:           December 3, 2009
 KernelVersion:  2.6.32
 Contact:        dmaengine@vger.kernel.org
 Description:	The number of descriptors active in the ring.
 
-What:           sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_size
+What:           /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_size
 Date:           December 3, 2009
 KernelVersion:  2.6.32
 Contact:        dmaengine@vger.kernel.org
 Description:	Descriptor ring size, total number of descriptors available.
 
-What:           sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/version
+What:           /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/version
 Date:           December 3, 2009
 KernelVersion:  2.6.32
 Contact:        dmaengine@vger.kernel.org
 Description:	Version of ioatdma device.
 
-What:           sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/intr_coalesce
+What:           /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/intr_coalesce
 Date:           August 8, 2017
 KernelVersion:  4.14
 Contact:        dmaengine@vger.kernel.org