remove "which are used for collision detection"

docs/api/en/math/Box3.html

@@ -12,7 +12,7 @@
 
 		<p class="desc">
 			Represents a box or cube in 3D space. The main purpose of this is to represent
-			the world-axis-aligned bounding boxes for objects, which are used for fast collision detection. 
+			the world-axis-aligned bounding boxes for objects. 
 		</p>