New subdomains behavior for SAML SSO

[shainaraskas]

Summary

• Clarified that claiming a domain for SAML SSO also enables SSO for all of its subdomains, and subdomains do not count toward the 10-domain limit. incl example.
• Reworded the mention of SAML SSO limitations at the organization level to "considerations" instead of "limitations" .

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

2. If you answered "Yes" to the previous question, please specify the tool(s) and model(s) used (e.g., Google Gemini, OpenAI ChatGPT-4, etc.).

Tool(s) and model(s) used: claude sonnet

[github-actions]

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[github-actions]

🔍 Preview links for changed docs

• deploy-manage/deploy/elastic-cloud/restrictions-known-problems.md
• deploy-manage/users-roles/cloud-organization/configure-saml-authentication.md

[github-actions]

Vale Linting Results

Summary: 2 suggestions found

💡 Suggestions (2)

File	Line	Rule	Message
deploy-manage/users-roles/cloud-organization/configure-saml-authentication.md	52	Elastic.Wordiness	Consider using 'all' instead of 'all of '.
deploy-manage/users-roles/cloud-organization/configure-saml-authentication.md	76	Elastic.Wordiness	Consider using 'all' instead of 'all of '.

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[yetanothertw]

LGTM, thank you! 🚀