Update Overview.bs

Author: khushalsagar

css-view-transitions-1/Overview.bs

@@ -899,9 +899,10 @@ The {{ViewTransition/domUpdated}} [=getter steps=] are to return [=this's=] [=Vi
 
         1. Let |element| be the [=page-transition pseudo-element=].
 
-        1. For each |animation| with [=effect target=] set to |element| and [=animation timeline=]
-            of type [=document timeline=], set |hasActiveAnimations| to true if any of the following
-            conditions is true:
+        1. For each |animation| that contains at least one [=animation effect=]
+            whose [=effect target=] is |element| and whose associated [=animation timeline=]
+            is of type [=document timeline=], set |hasActiveAnimations| to true if any of the
+            following conditions is true:
 
             1. |animation| is in <a lt="paused play state">paused</a> or <a lt="running play state">running</a> state.