docs(VVirtualScroll): renderless needs a positioned ancestor (#20975)

packages/api-generator/src/locale/en/VVirtualScroll.json

@@ -3,7 +3,7 @@
     "height": "Height of the component as a css value/",
     "itemKey": "Required when using **dynamic-item-height** together with object items. Should point to a property with a unique value for each item.",
     "items": "The array of items to display.",
-    "renderless": "Disables default component rendering functionality."
+    "renderless": "Disables default component rendering functionality. The parent node must be [a positioned element](https://developer.mozilla.org/en-US/docs/Web/CSS/position#types_of_positioning), e.g. using `position: relative;`"
   },
   "slots": {
     "default": "Default slot to render a single item."