cloud: add Terraform doc of essential cluster

[FingerLeader]

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[ti-chi-bot]

Hi @FingerLeader. 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]

Summary of Changes

Hello @FingerLeader, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands and refines the TiDB documentation. It introduces new content for TiDB Cloud's 'Essential' and 'Starter' cluster offerings, integrating them into the existing Table of Contents structures. The changes also encompass comprehensive updates to various documentation pages, detailing new functionalities like advanced indexing, optimized batch operations, and improved in-memory engine capabilities. The overall aim is to enhance clarity, consistency, and completeness of the documentation for both new and existing users.

Highlights

• New TiDB Cloud Cluster Documentation: Introduced comprehensive documentation for TiDB Cloud 'Essential' and 'Starter' cluster types, including dedicated Tables of Contents and updated terminology across the documentation set.
• Feature Documentation Enhancements: Added and updated documentation for several key features, such as multi-column indexes, batch processing capabilities (including Pipelined DML), and the TiKV MVCC in-memory engine, providing detailed explanations and usage guides.
• General Documentation Improvements: Performed extensive updates across various documentation pages, including best practices, tool usage, and SQL functions, to improve clarity, consistency, and accuracy, along with administrative changes to project ownership.

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[gemini-code-assist]

Code Review

This pull request adds a new documentation page explaining how to manage TiDB Cloud Essential clusters using the tidbcloud_serverless_cluster Terraform resource. The new document covers creating, modifying, importing, and deleting these clusters. My review focuses on improving clarity, conciseness, and technical accuracy to align with the documentation style guide. I've suggested several wording improvements and a correction to a link to ensure the documentation is easy for users to follow.

[ti-chi-bot]

@zhangyangyu: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[qiancai]

/ok-to-test

[ti-chi-bot]

@qiancai: Your lgtm message is repeated, so it is ignored.

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[qiancai]

/ok-to-test

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-09-08 06:55:31.056345052 +0000 UTC m=+257997.616226539: ☑️ agreed by qiancai.
• 2025-09-12 07:21:10.286344378 +0000 UTC m=+605136.846225875: ☑️ agreed by Oreoxmt.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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