[DOC release] Minor route template render doc change

Docs said 
> You can render `photos.hbs` into the `"anOutletName"` outlet of `application.hbs` by calling `render`

But passed in the `posts` template. 
I think it is good as is (we are supposed to be in the `posts` route rendering the `photos` template).

@Robdel12 - Can you update the commit prefix to `[DOC release]`?