Update ports section in services.md

[chubi-x]

Explicitly state the dangers if a port mapping binds to all interfaces

Description

We recently discovered that docker was bypassing our firewall rules when forwarding ports from a container using the standard <host port>:<container port> syntax. What this meant was that the container was effectively visible to the entire internet. It was only after some digging did we discover that it is possible and even recommended to explicitly bind the host port to localhost so it doesn't accept connections from everywhere. This PR updates the docs to explicitly state the potential dangers of not specifying a localhost when exposing docker container ports.

Reviews

• Technical review
• Editorial review
• Product review

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[docker-robot]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions.
As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment.
If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

[chubi-x]

/remove-lifecycle stale

[aevesdocker]

Thank you @chubi-x for the PR. This is documented elsewhere, but good idea to add at this point in the Compose docs too. I've made some style guide corrections and links to other useful information

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[aevesdocker]

@chubi-x could you rebase and then I can get this merged