* not specified the default calculated value is shown. The summaryRenderer is called with:
*
* - value {Object} - The calculated value.
- * - data {Object} - Contains all raw summary values for the row.
+ * - summaryData {Object} - Contains all raw summary values for the row.
* - field {String} - The name of the field we are calculating
*
* ## Example Usage
* dataIndex: 'student',
* text: 'Name',
* summaryType: 'count',
- * summaryRenderer: function(value){
+ * summaryRenderer: function(value, summaryData, dataIndex) {
* return Ext.String.format('{0} student{1}', value, value !== 1 ? 's' : '');
* }
* }, {