make introduction clearer

docs/api/en/helpers/BoxHelper.html

@@ -14,8 +14,7 @@
 
 		<p class="desc">
 			Helper object to show the world-axis-aligned bounding box around an object. 
-			It can be used to work with [page:Box3] items in order to easily compute the [link:https://en.wikipedia.org/wiki/Minimum_bounding_box Minimum Bounding Boxes] for objects, which are often used for fast collision detection. 
-
+			It can be used in synergy with [page:Box3] items in order to easily compute the [link:https://en.wikipedia.org/wiki/Minimum_bounding_box Minimum Bounding Boxes] for objects, and use them for fast collision detection. See [page:Box3.intersect].
 			Note that the object must have a [page:Geometry] or [page:BufferGeometry] for this to work,
 			so it won't work with [page:Sprite Sprites].
 		</p>