More targeted subscription clarification for serverless

[shainaraskas]

Summary

rework of #7094 to target the change just to the fact that subscriptions are not related to serverless features. avoids touching docs about ech, doesn't make any claims about cloud connect. improves x-linking

still moves out the feature downgrade behavior for sec solutions out

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• Yes
• No

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🔍 Preview links for changed docs

• deploy-manage/deploy/elastic-cloud/project-settings.md
• deploy-manage/license.md
• solutions/security/security-serverless-feature-tiers.md

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Elastic Docs Style Checker (Vale)

Summary: 1 suggestion found

💡 Suggestions (1): Optional style improvements. Apply when helpful.

File	Line	Rule	Message
solutions/security/security-serverless-feature-tiers.md	107	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.

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