docs: add FAQ on TiDB X and Dedicated Projects, detailing changes and…

[awxxxxxx]

… instance migration requirements

First-time contributors' checklist

• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

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By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
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[ti-chi-bot]

Hi @awxxxxxx. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[gemini-code-assist]

Code Review

This pull request introduces a new FAQ document explaining the transition to typed projects (TiDB X Project and Dedicated Project) in TiDB Cloud. The documentation outlines the differences between these project types and the necessity of moving TiDB X instances out of Dedicated Projects. The review feedback focuses on aligning the document with the style guide, specifically by applying sentence case to headings, adopting the second person ('you') to address users, preferring active voice over passive voice, and ensuring consistent terminology like using 'organization' instead of 'org'.

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