content: Reorder with virtual scroll doesn't provide an actual example

### URL

https://ionicframework.com/docs/api/reorder#usage-with-virtual-scroll

### Issue Description

Section "Usage with Virtual Scroll" in ion-reorder component doesn't provide an actual working example.

Open the linked ion-reorder documentation page and read the “Usage with Virtual Scroll” section in context, including nearby examples. Add an actual working example to that section and verify that it demonstrates reordering with virtual scroll as described.

Scritto dal modello di indicizzazione a partire dal testo della issue.