reword paragraph

Signed-off-by: Hannah Hunter <[email protected]>

Author: hhunter-ms

articles/azure-monitor/essentials/activity-log.md

@@ -46,7 +46,7 @@ Select **Download as CSV** to download the events in the current view.
 
 ### View change history
 
-For some events, you can view the change history, which shows what changes happened during that event time. Select an event from the activity log you want to look at more deeply. Select the **Change history (Preview)** tab to view any associated changes with that event.
+For some events, you can view the change history, which shows what changes happened during that event time. Select an event from the activity log you want to look at more deeply. Select the **Change history** tab to view any changes on the resource up to 30 minutes before and after the time of the operation.
 
 ![Screenshot that shows the Change history list for an event.](media/activity-log/change-history-event.png)