Introduce-Installation Guide-Code Error

[wuming123057]

The code change:

Title= new Title() {

        Text = "曲线折线图",
        Visible =true,
    },
    Description = new Description()
    {
        Visible = true,
        Text = "用平滑的曲线代替折线。",
    },
    Padding = "auto",
    ForceFit = true,
    XField = "year",
    YField = "value",
    Smooth = true,