Fix change summary example (#390)

Change-Id: Id5fe297d8669afdff40d0ece3b02df7af4b838d8

Author: nwbirnie

google-ads-examples/src/main/java/com/google/ads/googleads/examples/accountmanagement/GetChangeSummary.java

@@ -101,7 +101,7 @@ private void runExample(GoogleAdsClient googleAdsClient, long customerId) {
             + "change_status.feed_item "
             + "FROM change_status "
             + "WHERE change_status.last_change_date_time DURING LAST_14_DAYS "
-            + "ORDER BY change_status.last_change_date_time"
+            + "ORDER BY change_status.last_change_date_time "
             + "LIMIT 10000";
 
     try (GoogleAdsServiceClient client =