Improve [Search in Trash reference page](https://github.com/ibexa/documentation-developer-hackaton/blob/5.0/docs/search/search_in_trash_reference.md) so it looks like [Discounts Search Reference](https://github.com/ibexa/documentation-developer-hackaton/blob/5.0/docs/search/discounts_search_reference/discounts_criteria.md).
