Opa was actually there way before node.js. Let's mirror that comment to node, then. Also 'real time' as mentioned in the context of socket.io, or more generall

Opa was actually there way before node.js. Let's mirror that comment to node, then. Also 'real time' as mentioned in the context of socket.io, or more generally node.js, is not real time at all. It's just live. Real time has a precise meaning already.