[css-view-transitions-2] Dont call the update callback on VT for new the Document (#9848)

* Don't call the update callback for inbound transitions

This erroneously activates the transition before pagereveal dispatch.

* Indentation

* Link resolve

Author: khushalsagar

css-view-transitions-2/Overview.bs

@@ -490,9 +490,13 @@ The {{CSSViewTransitionRule}} represents a ''@view-transition'' rule.
 
 				1. Set |newDocument|'s [=active view transition=] to |inboundTransition|.
 
-				1. [=Call the update callback=] for |inboundTransition|.
+				1. [=Resolve=] |inboundTransition|’s [=ViewTransition/update callback done promise=] with undefined.
+
+				1. Set |inboundTransition|’s [=ViewTransition/phase=] to "`update-callback-called`".
 
 				1. Call |onReady|.
+					
+					Note: The |inboundTransition| is activated after the dispatch of {{Window/pagereveal}} to ensure mutations made in this event apply to the captured new state.
 
 				1. At any given time, the UA may decide to skip |inboundTransition|, e.g. after an [=implementation-defined=] timeout.
 					To do so, the UA should [=queue a global task=] on the [=DOM manipulation task source=] given |document|'s [=relevant global object=] to perform the following step: