private int maxLength(Map<String, CommandLine> subcommands, int max) {
			int result = subcommands.values()
				.stream()
				.map(cmd -> cmd.getCommandSpec().names().toString().length() - 2)
				.max(Integer::compareTo)
				.get();
			return Math.min(max, result);
		}
validate all commands in Help is covered by section and each section command
exist in help.

@param help
src/main/java/dev/jbang/cli/JBang.java