Modify Content in the Pages Widget

The Pages Widget is a widget that lists all the subpages and descriptions of these subpages of the page where the widget is placed.  

If you want to modify the content that displays in this widget, you can navigate to each individual subpage and Change the Page Menu Text or Configure Page Version Options to change the Description of that page. 

Once you modify the Menu Text or Description on the page you want to modify, the Pages Widget will automatically update on the parent page.