Compose: Add guidance for using host network in Swarm mode and Docker Stack

[deahtstroke]

Description

This PR adds a new how-to section explaining how to use the host network when deploying services in Swarm mode via docker stack deploy.

Key additions:

• YAML example showing how to reference the built-in host network as an external network.
• A note outlining key limitations when using host networking with Swarm, such as:
  • Only supported in global service mode
  • No support for Swarm ingress networking or service discovery
  • Port-binding limitations

This is meant to clarify a niche but important case for users deploying Compose files to Swarm clusters that need access to the host's network. Let me know if there are other cross-references I should do in other parts of the docs.

Related issues or tickets

Issue 22684

Reviews

• [ ] Technical review
• [ ] Editorial review
• [ ] Product review

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[aevesdocker]

Thanks for the PR @deahtstroke. Will take a look shortly

[deahtstroke]

Hi, any update on the review of this PR?