docs: Fix an issue with QuickStart.md

- Fixed an issue with "!!! Note"

docs/user_guide/QuickStart.md

@@ -88,8 +88,8 @@ This guide provides step-by-step instructions for building and running **Scenari
    sensor_model:=sample_sensor_kit \
    vehicle_model:=sample_vehicle timeout:=120.0
    ``` 
-   !!! Note 
-      To modify parameters of random testing and to obtain more details about the test results and the **result.junit.xml** file (which is saved by default in the **/tmp** directory), please refer to the **random_test_runner** [documentation](random_test_runner/Usage.md).
+!!! Note 
+    To modify parameters of random testing and to obtain more details about the test results and the **result.junit.xml** file (which is saved by default in the **/tmp** directory), please refer to the **random_test_runner** [documentation](random_test_runner/Usage.md).
 
    ![Launching random_test_runner](../image/random_test_runner_launch.gif)
    *The process of launching the `random_test_runner` node.*