Update Overview.bs

Author: khushalsagar

css-view-transitions-1/Overview.bs

@@ -481,7 +481,7 @@ callback UpdateDOMCallback = Promise<any> ();
 
     1. Set |document|'s [=active DOM transition=] to |transition|.
 
-        Note: The process continues in [=perform an outgoing capture=].
+        Note: The process continues in [=perform an outgoing capture=] which is executed at the next [=rendering-opportunity=].
 
     1. Return |transition|.
 </div>