chore: add rmw info

Author: maciejmajek

docs/setup_docker.md

@@ -21,6 +21,11 @@ docker build -t rai:jazzy --build-arg ROS_DISTRO=jazzy -f docker/Dockerfile .
 
 ## 2. Run the docker container
 
+> [!TIP]
+> If you intend to run demos on the host machine, ensure the docker container can communicate with it.
+> Test this by running the standard ROS 2 example with one node in docker and one on the host: [link](https://docs.ros.org/en/jazzy/Installation/Ubuntu-Install-Debs.html#try-some-examples).
+> If topics are not visible or cannot be subscribed to, try using [rmw_cyclone_dds](https://github.com/ros2/rmw_cyclonedds) instead of the default rmw_fastrtps_cpp.
+
 ### 2.1. Humble
 
 ```bash