example_2.md

Change the path of the RViz configuration and added a note.

ros2/example_2.md

@@ -59,9 +59,11 @@ ros2 run stretch_ros_tutorials scan_filter
 
 Then run the following command to bring up a simple RViz configuration of the Stretch robot.
 ```{.bash .shell-prompt}
-ros2 run rviz2 rviz2 -d `ros2 pkg prefix stretch_calibration`/rviz/stretch_simple_test.rviz
+ros2 run rviz2 rviz2 -d `ros2 pkg prefix stretch_calibration`/share/stretch_calibration/rviz/stretch_simple_test.rviz
 ```
-
+!!! note
+	If the laser scan or the filter doesn't appear, you can add it manually in Add, By Topic and you can find the filter_scan there.
+ 
 Change the topic name from the LaserScan display from */scan* to */filter_scan*.
 
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