web stories tutorial: broken link

[slmartinet]

📖 Missing or Out-of-Date Documentation

Problem

link is broken. leads to a 404.

Location

https://amp.dev/documentation/guides-and-tutorials/start/visual_story/setting_up/?format=stories

Paragraph Step 1. Download the code, last sentence The completed version of the story can be found in the pets-completed.html file.

The link to pets-completed.html is broken.

[ptcmariano]

I have fixed the broken link by updating the URL to the correct location. Review on this pull request: https://github.com/ampproject/amp.dev/pull/6673