--debug-level=True help function didn't help a new Meltano user

Was just debugging meltano with a new Meltano user. They hit an exception with tap-csv, had the standard "failed while in discovery" which pointing to logs (which they found), and then they tried to run with --log-level=DEBUG but it wasn't clear where to put --log-level=DEBUG so they did something like this

meltano elt tap-csv target-jsonl --job-id=abc --log-level=DEBUG

Easy fix is to probably just extend the message a bit to give an example of where to put --log-level? Easy MR to make but not sure if you'll agree!