Sync the Presentation API interfaces with the spec

Source/modules/presentation/DefaultSessionStartEvent.idl

Index: Source/modules/presentation/DefaultSessionStartEvent.idl
diff --git a/Source/modules/presentation/DefaultSessionStartEvent.idl b/Source/modules/presentation/DefaultSessionStartEvent.idl
index b9bdbd5d36458b287c86b4d8581219136ca35cfd..39bbd29dd334304c919907501313cd6c415dfd5b 100644
--- a/Source/modules/presentation/DefaultSessionStartEvent.idl
+++ b/Source/modules/presentation/DefaultSessionStartEvent.idl
@@ -2,9 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// https://w3c.github.io/presentation-api/#interface-defaultsessionstartevent
+
 [
     Constructor(DOMString type, optional DefaultSessionStartEventInit eventInitDict),
     RuntimeEnabled=Presentation
 ] interface DefaultSessionStartEvent : Event {
     readonly attribute PresentationSession session;
-};
+};