Clone instructions didn't work for me

Cloning the .git failed like so:

    $ git clone git@github.com:moai/moai-dev.git
    Cloning into 'moai-dev'...
    Warning: Permanently added the RSA host key for IP address '192.30.252.123' to the list of known hosts.
    Permission denied (publickey).
    fatal: Could not read from remote repository.
    
    Please make sure you have the correct access rights
    and the repository exists.

And I added the `cd` so it can actually all be copy-pasted and would just work.