deploy: some minor style changes for the seed node guide

[jklare]

• refactor the statements about the seed node to not start X sentences with "The seed node", but make it a list instead
• reword the requirements towards the operating system

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	5		0	0	0.04s
✅ JSON	jsonlint	4		0	0	0.12s
✅ JSON	prettier	4		0	0	0.41s
✅ JSON	v8r	4		0	0	8.71s
✅ MARKDOWN	markdownlint	160		0	0	2.69s
✅ MARKDOWN	markdown-table-formatter	160		0	0	0.37s
✅ REPOSITORY	checkov	yes		no	no	19.0s
✅ REPOSITORY	git_diff	yes		no	no	0.04s
✅ REPOSITORY	secretlint	yes		no	no	2.35s
✅ REPOSITORY	trufflehog	yes		no	no	4.05s
✅ SPELL	codespell	170		0	0	0.54s
⚠️ SPELL	lychee	170		3	0	21.63s
✅ YAML	prettier	6		0	0	0.41s
✅ YAML	v8r	6		0	0	6.93s
✅ YAML	yamllint	6		0	0	0.64s

Detailed Issues

⚠️ SPELL / lychee - 3 errors

📝 Summary
---------------------
🔍 Total..........922
🔗 Unique.........746
✅ Successful.....852
⏳ Timeouts.........6
🔀 Redirected......47
👻 Excluded........61
❓ Unknown..........0
🚫 Errors...........3
⛔ Unsupported......3

Errors in docs/appendix/security/ossa-2026-001.md
[TIMEOUT] https://bugs.launchpad.net/keystonemiddleware/+bug/2129018 (at 124:3) | Request timed out

Errors in docs/appendix/security/ossa-2026-002.md
[TIMEOUT] https://bugs.launchpad.net/nova/+bug/2137507 (at 111:3) | Request timed out

Errors in docs/appendix/security/ossa-2026-015.md
[TIMEOUT] https://bugs.launchpad.net/keystone/+bug/2148398 (at 174:3) | Request timed out
[TIMEOUT] https://bugs.launchpad.net/keystone/+bug/2148477 (at 175:3) | Request timed out
[TIMEOUT] https://bugs.launchpad.net/keystone/+bug/2150379 (at 179:3) | Request timed out

Errors in docs/appendix/security/ossa-2026-022.md
[TIMEOUT] https://bugs.launchpad.net/nova/+bug/2151252 (at 145:3) | Request timed out

Errors in docs/guides/deploy-guide/services/openstack.md
[ERROR] https://www.openstack.org/software/project-navigator/openstack-components#openstack-services (at 14:5) | Connection failed. Check network connectivity and firewall settings

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
[ERROR] https://www.openstack.org/software/openstack-bobcat (at 977:38) | Connection failed. Check network connectivity and firewall settings

Hint: Followed 47 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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