[DO] KV API status clarification

[Oxyjun]

Summary

1. Clarifying that KV API still remains (since it's supported by SQLite-backed DOs).
2. Turning the note into a partial file for easy maintenance.
3. Adding more detail into the note to mention other capabilities SQLite-backed DOs have (thereby further justifying the recommendation).
4. Moving the table of the API comparison up, so that it appears before the large note components.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Clarified the status of the KV API and improved documentation structure for SQLite-backed Durable Objects.

• Clarified that the KV API remains supported due to SQLite-backed Durable Objects.
• Converted the note into a partial file for easier maintenance.
• Enhanced the note with additional details about SQLite-backed Durable Objects' capabilities.
• Repositioned the API comparison table for better visibility.

Modified Files

• src/content/docs/durable-objects/api/storage-api.mdx
• src/content/docs/durable-objects/best-practices/access-durable-objects-storage.mdx
• src/content/docs/durable-objects/reference/durable-objects-migrations.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/durable-objects/	@elithrar, @vy-ton, @joshthoward, @oxyjun, @harshil1712, @cloudflare/pcx-technical-writing
*	@cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://080d640b.preview.developers.cloudflare.com
Preview Branch URL: https://jun-do-storage-api-clarification.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/durable-objects/api/storage-api/	https://jun-do-storage-api-clarification.preview.developers.cloudflare.com/durable-objects/api/storage-api/
https://developers.cloudflare.com/durable-objects/best-practices/access-durable-objects-storage/	https://jun-do-storage-api-clarification.preview.developers.cloudflare.com/durable-objects/best-practices/access-durable-objects-storage/
https://developers.cloudflare.com/durable-objects/reference/durable-objects-migrations/	https://jun-do-storage-api-clarification.preview.developers.cloudflare.com/durable-objects/reference/durable-objects-migrations/