message: Add HTML example to slidesToScroll
diff: @@ -298,6 +298,28 @@ const options = { slidesToScroll: 2 }
  const embla = EmblaCarousel(emblaNode, options)
  ```
  +```html
  +<div class="embla">
  + <div class="embla__container">
  + <!-- Group 1 -->
  + <div class="embla__slide">
  + Slide 1
  + </div>
  + <div class="embla__slide">
  + Slide 2
  + </div>
  +
  + <!-- Group 2 -->
  + <div class="embla__slide">
  + Slide 3
  + </div>
  + <div class="embla__slide">
  + Slide 4
  + </div>
  + </div>
  +</div>
  +```
  +
  <hr>
  </details>
  