update reference

ipa-vsp · ipa-vsp · commit c2a544283abe · 2025-06-17T11:36:50.000+02:00
diff --git a/workshop/source/_source/control/01_Example.md b/workshop/source/_source/control/01_Example.md
@@ -1,5 +1,7 @@
 # RRBot
 
+**![Reference from ros2_control_demos](https://control.ros.org/rolling/doc/ros2_control_demos/doc/index.html#)**
+
 **RRBot**, or *Revolute-Revolute Manipulator Robot*, is a simple 3-linkage, 2-joint arm used to demonstrate various features.
 
 It is essentially a double inverted pendulum and demonstrates some control concepts within a simulator. It was originally introduced for Gazebo tutorials.
