Add comments to summarize changes at top of each patch

[aws-spenceng]

For each patch in series, we should add comments at the top of each patch and explain what it's for and how to test the functionality

(03/08/24) Another link was added for webview.diff patch to evaluate script-src to explain how we made this change (see 2nd comment link below)

Original comment: #11 (comment)

2nd comment: https://github.com/aws/sagemaker-code-editor/pull/13/files#r1518235315