Change order of transform usage
Change order of transform usage

Reading the [API information about transforms](https://api.emberjs.com/ember-data/release/classes/DS.Transform), the order seemed a little off. First, we indicate a basic example for transforms, and the usage that makes reference (`app/transforms/temperature`) is at the end of this section, after an option slightly more advanced.

This change moves the usage snippet right after the example.

HeroicEric/data,HeroicEric/data,arenoir/data,HeroicEric/data,arenoir/data,arenoir/data,HeroicEric/data,arenoir/data