Update Box3.html

Fixed typo.

docs/api/en/math/Box3.html

@@ -42,7 +42,7 @@
 		[page:Vector3 min] - (optional) [page:Vector3] representing the lower (x, y, z) boundary of the box.
 		Default is ( + Infinity, + Infinity, + Infinity ).<br>
 
-		[page:Vector3 max] - (optional) [page:Vector3] representing the lower upper (x, y, z) boundary of the box.
+		[page:Vector3 max] - (optional) [page:Vector3] representing the upper (x, y, z) boundary of the box.
 		Default is ( - Infinity, - Infinity, - Infinity ).<br /><br />
 
 		Creates a [name] bounded by min and max.