typo fixed

Signed-off-by: Ericpotato <[email protected]>

Author: Ericpotato

docs/tutorials/ad-hoc-simulation/planning-simulation.md

@@ -228,37 +228,37 @@ To pass through an unsignalized crosswalk, the ego vehicle will first slow down
 
 1. Set an initial pose and a goal pose of the ego vehicle driving across an unsignalized crosswalk. A path will be planned.
 
-![unsignalized-placing-ego-vehicle](images/planning/passing-crosswalk/unsignalized-placing-ego-vehicle.png)
+   ![unsignalized-placing-ego-vehicle](images/planning/passing-crosswalk/unsignalized-placing-ego-vehicle.png)
 
 2. Place a dummy pedestrian on the crosswalk and set its pose as if it is crossing the street. 
 
-![unsignalized-crosswalk-start](images/planning/passing-crosswalk/unsignalized-crosswalk-start.png)
+   ![unsignalized-crosswalk-start](images/planning/passing-crosswalk/unsignalized-crosswalk-start.png)
 
 3. Engage the ego vehicle. The ego vehicle will decelerate and stop before the crosswalk. The marked **crosswalk** in the figure indicates that the stopping behavior is casued by the objects on the **crosswalk**.
 
-![unsignalized-crosswalk-stop](images/planning/passing-crosswalk/unsignalized-crosswalk-stop.png)
+   ![unsignalized-crosswalk-stop](images/planning/passing-crosswalk/unsignalized-crosswalk-stop.png)
 
 4. Wait for about three seconds. The ego vehicle will start moving again and cross the crosswalk.
 
-![unsignalized-crosswalk-move-again](images/planning/passing-crosswalk/unsignalized-crosswalk-move-again.png)
+   ![unsignalized-crosswalk-move-again](images/planning/passing-crosswalk/unsignalized-crosswalk-move-again.png)
 
 #### Signalized crosswalk
 
 1. Set the ego vehicle and a dummy pedestrian at an intersection, similar to the previous scenario. Given that the traffic light is `GREEN` by default, the ego vehicle behaves as it does at an unsignalized crosswalk, decelerating and stopping.
 
-![signalized-placing-ego-vehicle](images/planning/passing-crosswalk/signalized-placing-ego-vehicle.png)
+   ![signalized-placing-ego-vehicle](images/planning/passing-crosswalk/signalized-placing-ego-vehicle.png)
 
 2. Delete the dummy pedestrian and set the traffic light to `RED`. The ego vehicle will decelerate and stop before the crosswalk. The marked **traffic_light** in the figure indicates that the stop is casued by the **traffic_light**. The ego vehicle will not move until the traffic light turns green.
 
-![signalized-traffic-light-stop](images/planning/passing-crosswalk/signalized-traffic-light-stop.png)
+   ![signalized-traffic-light-stop](images/planning/passing-crosswalk/signalized-traffic-light-stop.png)
 
 3. Set a dummy pedestrian on the crosswalk agian. It can be seen that both the **traffic_light** and **crosswalk** (the two markings may overlap) affact the stopping behavior.
 
-![signalized-traffic-light-crosswalk-stop.png](images/planning/passing-crosswalk/signalized-traffic-light-crosswalk-stop.png)
+   ![signalized-traffic-light-crosswalk-stop.png](images/planning/passing-crosswalk/signalized-traffic-light-crosswalk-stop.png)
 
 4. Set the traffic light to `GREEN` and engage the vehicle, the ego vehicle will stop for safety check and start move again.
 
-![signalized-passing](images/planning/passing-crosswalk/signalized-passing.png)
+   ![signalized-passing](images/planning/passing-crosswalk/signalized-passing.png)
 
 ## Using Autoware Launch GUI