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>