CLI walkthrough: installing Homebrew on Mac: instructions out of date?

On the walkthrough for installing on Mac, answer: Mac, No, Yes, No to get to the brew install instructions.

The suggested command is
```
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
```

But the Homebrew page suggests
```
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
```

I wonder if the ruby command is out of date.