fix tutorial.fs
fix tutorial.fs

bleis-tift/FSharpVSPowerTools,enricosada/VisualFSharpPowerTools,isaacabraham/VisualFSharpPowerTools,bentayloruk/FSharpVSPowerTools,dedale/VisualFSharpPowerTools,fsprojects/VisualFSharpPowerTools,0x53A/VisualFSharpPowerTools,vasily-kirichenko/FSharpVSPowerTools,xperiandri/VisualFSharpPowerTools,fsprojects/VisualFSharpPowerTools,yever/VisualFSharpPowerTools,vasily-kirichenko/FSharpVSPowerTools,cloudRoutine/VisualFSharpPowerTools,forki/FSharpVSPowerTools,smoothdeveloper/VisualFSharpPowerTools,dkinitiate/VisualFSharpPowerTools,ovatsus/VisualFSharpPowerTools,bleis-tift/FSharpVSPowerTools,enricosada/VisualFSharpPowerTools,cloudRoutine/VisualFSharpPowerTools,dungpa/PowerTools