Fix wiki documentation for Shell about nake HOT 5 OPEN

var result = await $"dir";
WriteLine(result.ExitCode);
result.StdOut.ForEach(WriteLine);

#r "nuget: Nake.Meta" // for Nake attribute
#r "nuget: Nake.Utility" // for all other class

using Nake;
using static Nake.Shell;
using static System.Console;

[Nake] void Default() {
    Console.WriteLine("Default();");
    Nake.Session.Exit("ok");
}

#r "nuget: Nake.Meta" // for Nake attribute
#r "nuget: Nake.Utility" // for all other class

using Nake;
using static Nake.Shell;
using static System.Console;

[Nake] async Task Default() {
    await $"dir";
    Nake.Session.Exit("ok");
}

#r "nuget: Nake.Meta" // for Nake attribute
#r "nuget: Nake.Utility" // for all other class

using Nake;
using static Nake.Shell;
using static System.Console;

[Nake] async Task Default() {
    var result = await $"dir";
    Nake.Session.Exit("ok");
}