Fix x & y axes in sample (#219)

Author: luisquintanilla

docs/02_1_bar-and-column-charts.fsx

@@ -45,7 +45,7 @@ or horizontally. A vertical bar chart is called a column bar chart.
 ### Column Charts
 *)
 
-let column = Chart.Column(keys,values)
+let column = Chart.Column(values,keys)
 
 (*** condition: ipynb ***)
 #if IPYNB
@@ -61,7 +61,7 @@ column |> GenericChart.toChartHTML
 *)
 
 let bar =
-    Chart.Bar(keys,values)
+    Chart.Bar(values,keys)
 
 (*** condition: ipynb ***)
 #if IPYNB
@@ -82,8 +82,8 @@ The following example shows how to create a stacked bar chart by combining bar c
 
 let stackedBar =
     [
-        Chart.StackedBar(keys,values,Name="old");
-        Chart.StackedBar(keys,[8; 21; 13;],Name="new")
+        Chart.StackedBar(values,keys,Name="old");
+        Chart.StackedBar([8; 21; 13;],keys,Name="new")
     ]
     |> Chart.combine
 
@@ -102,8 +102,8 @@ stackedBar |> GenericChart.toChartHTML
 
 let stackedColumn =
     [
-        Chart.StackedColumn(keys,values,Name="old");
-        Chart.StackedColumn(keys,[8; 21; 13;],Name="new")
+        Chart.StackedColumn(values,keys,Name="old");
+        Chart.StackedColumn([8; 21; 13;],keys,Name="new")
     ]
     |> Chart.combine