public HelpPrinter positional(String name, String description) {
        positional = Arg.positional(name, description);
        return this;
    }
Defines a positional argument.

@param name Name of the positional argument (e.g., {@code <MODEL...>})
@param description Description of the argument.
@return Returns the printer.
smithy-cli/src/main/java/software/amazon/smithy/cli/HelpPrinter.java