Docker usage fails with "login required"

When using:
```
docker pull rustfs/cli:latest
docker run --rm rustfs/cli:latest rc --help
```

I receive:
```
Error response from daemon: pull access denied for rustfs/cli, repository does not exist or may require 'docker login'
```

I did find out that it should be `rustfs/rc:latest` not `rustfs/cli:latest` — so the documentation at https://rustfs.com/download/cli/ is outdated for docker.