The current description of the EXPOSE command for Dockerfiles is a little bit misleading. It indicates that the EXPOSE command actually "opens" any ports for the outside world, which is not true. In this way, the description suggests that using the EXPOSE directive is absolutely necessary for doing a port mapping for the containerized flask app. This commit fixes that and replaces the existing description of the EXPOSE command, whilst also adding a hint for not mix up the meanings of "expose" and "publish".
The current description of the EXPOSE command for Dockerfiles is a little bit misleading. It indicates that the EXPOSE command actually "opens" any ports for the outside world, which is not true. In this way, the description suggests that using the EXPOSE directive is absolutely necessary for doing a port mapping for the containerized flask app. This commit fixes that and replaces the existing description of the EXPOSE command, whilst also adding a hint for not mix up the meanings of "expose" and "publish".

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