Making it extra clear where the new template goes

It took me a little while to figure out where to put the new template, even though it is stated in the text.

So I put the body tag into the example html to make it extra clear.
Maybe, but when I toyed with that it got a bit weird. And it doesn't seem to be the general pattern, e.g. how the stuff inserted before the `</body>` on the [Accepting Edits](http://emberjs.com/guides/getting-started/accepting-edits) page doesn't include the start `<body>` tag.