Sharpen wording in docs on passwordless SSH connection

The docs state that the user should "Set up passwordless ssh to your server. Usually this means you have ssh-agent running with your private key loaded". Does it matter if `ssh-agent` is not used? It would be nice with an additional sentence along the lines of "This has only been tested by using `ssh-agent` for passwordless access", or "As long as you have passwordless access (i.e. you are not prompted for a password when running `ssh @, you are good to go.", to inform users about what they should do and expect.