Reword and move note to the end, add headline

Signed-off-by: Aleksi Peebles <aleksi@iki.fi>

docs/book/helpers/partial.md

@@ -4,11 +4,6 @@ The `Partial` view helper is used to render a specified template within its own
 variable scope. The primary use is for reusable template fragments with which
 you do not need to worry about variable name clashes.
 
-> Note that it is also possible to render a template within its own variable
-> scope by calling `RendererInterface::render()` with a `$values` argument.
-> See the documentation for [`PhpRenderer`](../php-renderer.md#render) for
-> more information.
-
 A sibling to the `Partial`, the `PartialLoop` view helper allows you to pass
 iterable data, and render a partial for each item.
 
@@ -80,6 +75,14 @@ Which would then render:
 > access to your row objects within the view scripts, allowing you to call
 > methods on them (such as retrieving values from parent or dependent rows).
 
+> ### An alternative to using Partial
+>
+> Note that it is also possible to render a template within its own variable
+> scope by directly calling `RendererInterface::render()` with a `$values`
+> argument. You might prefer to do this if your model is an array, or an
+> object that implements `ArrayAccess`. See the documentation for
+> [`PhpRenderer`](../php-renderer.md#render) for more information.
+
 ## Using PartialLoop to Render Iterable Models
 
 Typically, you'll want to use partials in a loop, to render the same content