Correcting minor formatting errors in licensing and README

Author: brmur

python/example_code/cognito/scenarios/identity_pools_example_demo/web/frontend/js/app-init.js

@@ -1,7 +1,5 @@
-/*
- * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
- * SPDX-License-Identifier: Apache-2.0
- */
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 
 document.addEventListener('DOMContentLoaded', async function() {
     try {

python/example_code/cognito/scenarios/identity_pools_example_demo/web/frontend/js/auth-core.js

@@ -1,7 +1,5 @@
-/*
- * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
- * SPDX-License-Identifier: Apache-2.0
- */
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 
 // Configuration - Load from environment or backend
 let CONFIG = {

python/example_code/cognito/scenarios/identity_pools_example_demo/web/frontend/js/flow-visualizer.js

@@ -1,7 +1,5 @@
-/*
- * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
- * SPDX-License-Identifier: Apache-2.0
- */
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 
 class APIFlowManager {
     constructor() {