[Mono-docs-list] Minor doc error in System.Random class

[Sidney Fong]

>Method
>- Next(int)  : int
> Returns a pseudo-random positive number less than the specified maximum.

Should be
> Returns a pseudo-random non-negative number less than the specified maximum.

By the way, "integer" would be more specific than "number", but I
guess that's a matter of style.

Regards,
Sidney