fvtt-hero-system-6/templates/partials/partial-item-description.hbs

<div class="tab description" data-group="primary" data-tab="description">
  <div>
    <label class="generic-label">Description</label>
    <div class="medium-editor item-text-long-line">
    {{editor description target="system.description" button=true owner=owner editable=editable}}
    </div>
  </div>
  <div>
    <label class="generic-label">Notes</label>
    <div class="medium-editor item-text-long-line">
    {{editor notes target="system.notes" button=true owner=owner editable=editable}}
    </div>
  </div>
</div>