Document usage of network validation

[janhorstmann]

Closes: osism/issues#1410

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	5		0	0	0.05s
✅ JSON	jsonlint	4		0	0	0.12s
✅ JSON	prettier	4		0	0	0.42s
✅ JSON	v8r	4		0	0	8.18s
✅ MARKDOWN	markdownlint	156		0	0	2.34s
✅ MARKDOWN	markdown-table-formatter	156		0	0	0.42s
✅ REPOSITORY	betterleaks	yes		no	no	0.72s
✅ REPOSITORY	checkov	yes		no	no	20.8s
✅ REPOSITORY	git_diff	yes		no	no	0.04s
✅ REPOSITORY	secretlint	yes		no	no	1.8s
✅ REPOSITORY	trufflehog	yes		no	no	4.83s
✅ SPELL	codespell	166		0	0	0.62s
⚠️ SPELL	lychee	166		4	0	28.77s
✅ YAML	prettier	6		0	0	0.42s
✅ YAML	v8r	6		0	0	7.1s
✅ YAML	yamllint	6		0	0	0.61s

Detailed Issues

⚠️ SPELL / lychee - 4 errors

📝 Summary
---------------------
🔍 Total..........879
🔗 Unique.........719
✅ Successful.....811
⏳ Timeouts.........3
🔀 Redirected......49
👻 Excluded........61
❓ Unknown..........0
🚫 Errors...........4
⛔ Unsupported......4

Errors in docs/guides/configuration-guide/openstack/index.md
[404] https://github.com/openstack/kolla/blob/master/docker/base/set_configs.py (at 370:30) | Rejected status code: 404 Not Found
[404] https://github.com/openstack/kolla/blob/master/docker/base/start.sh (at 369:37) | Rejected status code: 404 Not Found

Errors in docs/guides/deploy-guide/services/openstack.md
[TIMEOUT] https://www.openstack.org/software/project-navigator/openstack-components#openstack-services (at 14:5) | Request timed out

Errors in docs/guides/developer-guide/style-guide.md
[TIMEOUT] https://wiki.openstack.org/wiki/GitCommitMessages (at 79:1) | Request timed out

Errors in docs/release-notes/index.md
[ERROR] https://release.osism.tech/ (at 11:1) | Connection failed. Check network connectivity and firewall settings

Errors in docs/release-notes/osism-7.md
[TIMEOUT] https://www.openstack.org/software/openstack-bobcat (at 977:38) | Request timed out

Errors in docs/release-notes/osism-8.md
[ERROR] https://docs.openstack.org/releasenotes/designate/2024.1.html (at 231:14) | Connection closed before response completed

Hint: Followed 49 redirects. You might want to consider replacing redirecting URLs with the resolved URLs. Use verbose mode (`-v`/`-vv`) to see redirection details.

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