Update css-view-transitions-1/Overview.bs

Co-authored-by: Khushal Sagar <63884798+khushalsagar@users.noreply.github.com>

Author: vmpstr

css-view-transitions-1/Overview.bs

@@ -1117,7 +1117,7 @@ The {{ViewTransition/domUpdated}} [=getter steps=] are to return [=this's=] [=Vi
 
     1. [=Assert=]: |transition|'s [=ViewTransition/phase=] is [=phases/before=] "`dom-update-callback-called`".
 
-    1. Consider |transition|'s [=ViewTransition/DOM update callback=]:
+    1. Let |callbackPromise| be [=a new promise=] in |transition|'s [=relevant Realm=].
 
         * If it is null, then resolve |callbackPromise|.