Fixing Mixed Content issue in sample

Fixing Mixed Content issue in sample

Author: MayaKirova

HTMLSamples/grid/append-rows-on-demand.html

@@ -91,7 +91,7 @@ <h3>$$(AppendRowsOnDemand_Button_Caption)</h3>
         });
 
         $('#autoAppendRowsOnDemand').igGrid({
-            dataSource: 'https://igniteui.com/api/tweets',
+            dataSource: 'https://www.igniteui.com/api/tweets',
             responseDataKey: 'Records',
             autoGenerateColumns: false,
             enableUTCDates: true,
@@ -119,7 +119,7 @@ <h3>$$(AppendRowsOnDemand_Button_Caption)</h3>
         });
 
         $('#buttonAppendRowsOnDemand').igGrid({
-            dataSource: 'https://igniteui.com/api/tweets',
+            dataSource: 'https://www.igniteui.com/api/tweets',
             responseDataKey: 'Records',
             autoGenerateColumns: false,
             enableUTCDates: true,