[dts] [PATCH] framework/tester: fix a typo

[Liu, Yong]

Thanks Rami, applied.

On 02/01/2018 12:10 AM, Rami Rosen wrote:
> This patch fixes a trivial typo in send_ping() documentation
> of framework/tester: it should be ping4 and not ping6.
>
> Signed-off-by: Rami Rosen<rami.rosen at intel.com>