Creates a new page for EIS Region and hosting content

[kosabogi]

Summary

This PR pulls region and hosting info out of Supported models into its own page under EIS so it’s easier to find in the nav.

• Adds eis-region-and-hosting.md and lists it in the EIS section of the TOC
• Leaves a short link on the supported models page instead of the full section
• Updates the self-managed clusters doc link and adds a redirect for the old #eis-regions anchor

Related issue: #6733

Generative AI disclosure

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

• Yes
• No

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🔍 Preview links for changed docs

• explore-analyze/elastic-inference/connect-self-managed-cluster-to-eis.md
• explore-analyze/elastic-inference/eis-rate-limits.md
• explore-analyze/elastic-inference/eis-region-and-hosting.md
• explore-analyze/elastic-inference/eis-supported-models.md
• explore-analyze/elastic-inference/eis.md

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Elastic Docs Style Checker (Vale)

Summary: 2 warnings, 2 suggestions found

⚠️ Warnings (2): Fix when the suggestion improves clarity or correctness.

File	Line	Rule	Message
explore-analyze/elastic-inference/eis-rate-limits.md	19	Elastic.Spelling	'Nano' is a possible misspelling.
explore-analyze/elastic-inference/eis-rate-limits.md	23	Elastic.Spelling	'Nano' is a possible misspelling.

💡 Suggestions (2): Optional style improvements. Apply when helpful.

File	Line	Rule	Message
explore-analyze/elastic-inference/eis-region-and-hosting.md	25	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
explore-analyze/elastic-inference/eis-region-and-hosting.md	25	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.

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[seanhandley]

Thanks @kosabogi !

Just to put this into context, all of the EIS info was previously on https://www.elastic.co/docs/explore-analyze/elastic-inference/eis

Then the "Supported models" sub page was added with all the model tables on it.

However, it also got the sections which followed: Region & Hosting, Rate Limits, & Pricing.

I think we can either move all three of those sections back up to the top level page again, or consider having sub-pages, or a combined approach.

My preference would be to move the Pricing section up to the top level page, and to have a new Rate Limits sub-page, alongside the Region & Hosting sub-page in this PR.

[kosabogi]

Thanks @kosabogi !

Just to put this into context, all of the EIS info was previously on https://www.elastic.co/docs/explore-analyze/elastic-inference/eis

Then the "Supported models" sub page was added with all the model tables on it.

However, it also got the sections which followed: Region & Hosting, Rate Limits, & Pricing.

I think we can either move all three of those sections back up to the top level page again, or consider having sub-pages, or a combined approach.

My preference would be to move the Pricing section up to the top level page, and to have a new Rate Limits sub-page, alongside the Region & Hosting sub-page in this PR.

Thanks, Sean! I applied your suggestions:

• Moved the Pricing section to the top-level page
• Created a new Rate Limits subpage

Let me know how it looks now.

[shainaraskas]

little link update in admin docs lgtm