[google-appengine] Code Editor not found at UI location given in docs.

Google Cloud docs page https://cloud.google.com/blog/products/gcp/introducing-google-cloud-shels-new-code-editor says but I find no such button or command showing on the UI: What I do find is this:

[google-appengine] Code editor

What code editor are people using? I'd like to use an integrated web-based code editor, saving files directly on my VM's file structure, instead of using "vi" The code editor I was hoping to find is no longer available https://cloudplatform.googleblog.com/2016/10/introducing-Google-Cloud-Shels