Add more clarifying language distinguishing node name from AP SSID name

[dismantl]

Pre-v1 version of Commotion didn't fully distinguish node name from AP SSID name, since they used the same field in the Quick Start to set both. Users who are familiar with the old versions of Commotion expressed a desire to see more clarifying language about the role and differences between the two, in the Basic Config/Setup Wizard.