bad example for main_parameter

[rzwitserloot]

Given that the type of 'debug' is Integer, the parameter needs a value, no?

alternative way to fix this is to change line 1375 into private boolean debug = false;

[ghost]

Actually, in this example debug is not a flag to toggle debugging but setting the debug level. I agree that the example usage should include --debug 2.

[mkarg]

Thank you for your contribution! Can you please fix the conflicts and modify index.adoc accordingly? Thanks!