Steps to reproduce

cutechess-cli -debug

I'm on commit 4b33169

Expected behavior

Either cutechess-cli should support -debug with no value, or the docs should say that a value is required. currently all the info I can find is "-debug: Display all engine input and output", implying that debug shouldn't have a value.

I'd like to fix this myself as its far from a big issue but I'm not sure what the process is for editing the docs (i.e. what I actually need to edit to change all the docs and help text).

Actual behavior

Warning: Empty value for option "-debug"

The option actually needs to be set as "-debug all"