DOCSP-3462: [Charts] As an author, I can turn data table totals on and off (#118)

* DOCSP-3462: [Charts] As an author, I can turn data table totals on and off

Author: steveren

source/chart-type-reference/data-table.txt

@@ -210,9 +210,9 @@ divider.
 Reorder Data Table Columns
 --------------------------
 
-Users with the and author :ref:`role <dashboard-roles>` on data tables
-can reorder data table columns in the :doc:`Chart Builder
-</build-charts>`.
+Users with the author and owner :ref:`roles <dashboard-roles>`
+on data tables can reorder data table columns in the :doc:`Chart
+Builder </build-charts>`.
 
 To reorder data table columns, click and drag column headers to the
 desired order.
@@ -237,3 +237,30 @@ Considerations
   being :guilabel:`Groups` or :guilabel:`Values`.
 
 - You cannot reorder :guilabel:`Dynamic Columns`.
+
+Toggle Row and Column Totals
+----------------------------
+
+By default, data tables include a Column Totals row, which consists of
+a row of values with sum totals for each column. Optionally, you can
+enable a Row Totals column, which consists of a column of
+values containing sum totals for each row.
+
+The following image shows a detail from a data table with row and
+column totals enabled and added text indicating which is which:
+
+.. figure:: /images/charts/row-column-totals.png
+   :figwidth: 541px
+   :alt: Data table with row and column totals
+
+To toggle the totals on and off:
+
+1. Navigate to the :guilabel:`Customization` tab in the
+   :doc:`Chart Builder </build-charts>`.
+
+#. In the :guilabel:`General Customization` section, set the
+   :guilabel:`Column Totals` and :guilabel:`Row Totals` toggles
+   to the desired settings.
+
+For a complete list of Chart Customization options, see :doc:`Customize
+Charts </customize-charts/>`.