Add missing language suggestion

Author: Sushant-Chavan

tutorials/docs/navigation2_with_vector_objects.rst

@@ -17,7 +17,7 @@ Overview
 ========
 
 This tutorial shows how to navigate with vector objects added to raster costmaps.
-They can be used for various purposes, such as hiding some areas or sticking-out robot parts, for adding virtual obstacles on maps, or like Costmap Filters do - adding keep-out or maximum speed restricted areas, but on a vector (polygon or shape) basis.
+They can be used for various purposes, such as hiding some areas or sticking-out robot parts, for adding virtual obstacles on maps, or like Costmap Filters do with rastered maps, but on a vector (polygon or shape) basis.
 In this tutorial, the added vector objects will be treated as obstacles in costmaps using a Keepout Filter.
 To do this, we need to prepare the Nav2 stack with the Keepout Filter enabled, along with the Vector Object server which publishes an ``OccupancyGrid`` map with the rasterized vector objects as an input mask for the Keepout Filter.
 Other use cases use similar principles and could be easily adapted after finishing this tutorial.