add a line

Viralpanchal7899 · Viralpanchal7899 · commit 5937e4bde4cd · 2025-06-16T08:53:13.000-04:00
diff --git a/docs/modules/12_appendix/external_sensors_main.rst b/docs/modules/12_appendix/external_sensors_main.rst
@@ -56,6 +56,7 @@ Ultrasonic sensors are commonly used in indoor robots and some automotive autono
 
 References
 ----------
+
 - Wikipedia articles:
 
   - `Lidar Sensors <https://en.wikipedia.org/wiki/Lidar>`_
