docs: update docker run example to include using --init for process c…

…leanup

docs/install_docker.md

@@ -38,7 +38,7 @@ are shown below in the run command.
 
 ```shell
 # start container into the background and run the core-daemon by default
-sudo docker run -itd --name core -e DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix:rw --privileged --entrypoint core-daemon core
+sudo docker run -itd --name core -e DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix:rw --privileged --init --entrypoint core-daemon core
 # enable xhost access to the root user, this will allow you to run the core-gui from the container
 xhost +local:root
 # launch core-gui from the running container launched previously