update docker image README

Author: tpoignonec

.docker/README.md

@@ -2,6 +2,6 @@
 Provides a basic preconfigured docker container for development purposes. To use it, make sure you have [Docker](https://docs.docker.com/get-docker/) installed, then build and run the image :
 
 ```shell
-$ docker build --tag ethercat_driver:humble --file .docker/Dockerfile .
-$ docker run -it --privileged --network=host ethercat_driver:humble
+$ docker build --tag ethercat_driver:jazzy --file .docker/Dockerfile .
+$ docker run -it --privileged --network=host ethercat_driver:jazzy
 ```