[Docs] Reference missing entry on ‘style property reference'

The [‘Expressions’ section’](https://hyperscript.org/reference/#expressions) of the hyperscript reference docs explains:
- query references such as ``,
- id references such as `#id`,
- class references such as `.class` and
- attribute references such as `@attr`

But there is no entry for **style property references**, such as `*property`, even though they are an integral part of the language.

In the hyperscript docs, they are included in the [‘DOM literals’ section](https://hyperscript.org/docs/#dom-literals), along with all other ‘reference expresssions’ listed above.