Put an example of retrieving DataColumn from typed DataTable in "data modification" documentation page

Author: smoothdeveloper

docs/content/data modification.fsx

@@ -133,6 +133,13 @@ The IntelliSense experience is left a little clunky to retain legacy `DataRow` t
 let firstRow = currencyRates.Rows.[0]
 firstRow.AverageRate
 
+(**
+It is possible to get a reference to the DataColumn object
+*)
+
+let averageRateColumn = currencyRates.Columns.AverageRate
+
+
 (**
 The `AddRow` method adds a new row to a table.