This isn't in AMP but on the AMP Start and Building Tutorials

### Description

On this page: https://amp.dev/documentation/guides-and-tutorials/start/converting/building-page - the javascript that is displayed and to be copied `` is incorrect ans should be ``. Very minor. But For Newbs such as me, it was a little confusing that I was getting errors when there should be none.

### Reproduction Steps

Go to this page: https://amp.dev/documentation/guides-and-tutorials/start/converting/building-page and follow the instructions. You will produce errors because the link to the current CDN javascript is incorrect.

### Relevant Logs

_No response_

### Browser(s) Affected

Chrome

### OS(s) Affected

_No response_

### Device(s) Affected

_No response_

### AMP Version Affected

2212271632

Open the referenced AMP Start and Building Tutorials page and locate the displayed amp-script script tag. Compare its CDN URL with the current amp-script URL described in the issue, then verify the tutorial no longer produces the reported errors when followed in Chrome.

Written by the indexing model from the issue text.