Documentation of settings containing arrays is incomplete

[nils-a]

Currently, the use of arrays in settings is only documented for CommandArguemts like

[CommandArgument(0, "[name]")]
public string[] Name { get; set; }

But not for CommandOptions, as asked in #330, #465.

Additionally, the fact that there can be only one argument vector, and it needs to be the last argument of the command, is currently not documented at all.