IndexedDB: Add draft/proposal links for some experimental APIs in IDLs

Source/modules/indexeddb/IDBDatabase.idl

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
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  *
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  * 2.  Redistributions in binary form must reproduce the above copyright
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  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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-// http://www.w3.org/TR/IndexedDB/#idl-def-IDBDatabase
+// https://w3c.github.io/IndexedDB/#idl-def-IDBDatabase
 
 [
     Exposed=(Window,Worker),
     ActiveDOMObject,
     GarbageCollected,
 ] interface IDBDatabase : EventTarget {
     readonly attribute DOMString name;
-    // DOMString version is non-standard, to support databases created with old API.
+    // TODO(jsbell): DOMString version is non-standard, to support databases created with old API.
     readonly attribute (unsigned long long or DOMString) version;
     readonly attribute DOMStringList objectStoreNames;
+
     [RaisesException] IDBObjectStore createObjectStore(DOMString name, optional IDBObjectStoreParameters options);
     [RaisesException] void deleteObjectStore(DOMString name);
     [CallWith=ScriptState, RaisesException] IDBTransaction transaction((DOMString or sequence<DOMString> or DOMStringList) storeNames, optional IDBTransactionMode mode = "readonly");
     void close();
+
     attribute EventHandler onabort;
     attribute EventHandler onclose;
     attribute EventHandler onerror;
     attribute EventHandler onversionchange;
 };