Black Box Job step documentation needs to be improved

[jmv-NRC]

I was trying to setup a black box job step to demux my TRACE xtv files but could not find adequate documentation to get the arguments setup correctly in the configuration tool

[NRCgg]

I was trying to help @jmv-NRC with this and was also lost as to how to setup the demux tool as a job-step in job-stream in SNAP. I think a in-depth tutorial and video on setting up applications using the black-box plugin would be very useful.