fix some docs

Author: kMutagene

docs/01_6_Sliders.fsx

@@ -65,7 +65,7 @@ let scattersChart =
                             Size = 6
                         )
                     )
-                |> Chart.withTraceName(Visible=chartVisibility)
+                |> Chart.withTraceInfo(Visible=chartVisibility)
             go
         )
     |> GenericChart.combine

docs/index.fsx

@@ -211,7 +211,7 @@ One of the main design points of Plotly.NET it is to provide support for multipl
 
 [(1,5);(2,10)]
 |> Chart.Point
-|> Chart.withTraceName("Hello from F#",ShowLegend=true)
+|> Chart.withTraceInfo("Hello from F#",ShowLegend=true)
 |> Chart.withYAxisStyle("xAxis",ShowGrid= false, ShowLine=true)
 |> Chart.withXAxisStyle("yAxis",ShowGrid= false, ShowLine=true)