Add the ordering of dimensions to touchpad-edge-detector documentation
Currently the documentation for touchpad-edge-detector
https://gitlab.freedesktop.org/libevdev/libevdev/-/blob/master/tools/touchpad-edge-detector.c#L50
says:
The first argument is the physical size of the touchpad in mm
This does not specify if the format is WxH or HxW, I think that this confusion is what resulted in https://github.com/systemd/systemd/issues/15694, also when I was filing that issue I was not sure if I was using the tool correctly. From context clues and convention it seems reasonable to assume it is WxH, but it might be worth making this explicit. I propose changing the documentation to read:
The first argument is the physical size of the touchpad in mm with format WIDTHxHEIGHT