[igt-dev] [PATCH i-g-t] tests/kms_hdmi_inject: document how the test works

[Arkadiusz Hiler]

On Mon, May 20, 2019 at 05:59:04PM +0300, Simon Ser wrote:
> It's not immediately obvious what injection and ELDs are, and what is tested.
> 
> This commit adds a few comments to help readers understand this test. In case
> the test breaks, this could help.
> 
> Signed-off-by: Simon Ser <simon.ser at intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler at intel.com>