[example_12/README.md] Fix wrong title in README.md

ros-controls · Sep 25, 2023 · 250522a · 250522a
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 # ros2_control_demo_example_12
 
-   This example demonstrates the switching between simulation and real hardware by means of the *RRBot* - or ''Revolute-Revolute Manipulator Robot''.
+   This example shows how to write a simple chainable controller, and how to integrate it properly to have a functional controller chaining.
 
 Find the documentation in [doc/userdoc.rst](doc/userdoc.rst) or on [control.ros.org](https://control.ros.org/master/doc/ros2_control_demos/example_12/doc/userdoc.html).