official doc is not working

This is not an issue about this project, but about the official doc. ( https://fly.io/docs/reference/redis/ ）

The Official doc for running a new REDIS is totally not working, it would generate an incorrect `fly.toml` and doesn't work.

I spent hours until I found this demo project, and its `fly.toml` is correct

Please contact related employee to fix the bug, thanks ~