Updated the RowMethods interface (DefinitelyTyped#11665)

* Updated the RowMethods interface

This Interface was missing the Definition of the id() method.

Link to official documentation: https://datatables.net/reference/api/row().id()

* Changed indentation from tabs to spaces

jquery.dataTables/jquery.dataTables.d.ts

@@ -902,6 +902,13 @@ declare namespace DataTables {
         * @param d Data to use for the row.
         */
         data(d: any[] | Object): DataTable;
+
+        /**
+        * Get the id of the selected row.
+        *
+        * @param hash Set to true to append a hash (#) to the start of the row id.
+        */
+        id(hash?: boolean): string;
 
         /**
         * Get the row index of the row column.