[DOC release] Expand Route#render options documentation

This also updates it to reflect the additional `model` param you can pass
(enabled since 33a9891bff06ccce9bbc66e2acce9360f13ecdbd)
Yes, if you supply specifically supply  `templateName` to view, which is pretty old school for 1.0 which reversed the view/template relationship: http://emberjs.jsbin.com/yuqesulo/1/

That continues to work to not break older apps, but isn't mentioned much.