release-8.5: update the note about vector search support

[qiancai]

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[gemini-code-assist]

Summary of Changes

Hello @qiancai, 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 provides a comprehensive update to the TiDB documentation, aligning it with the 8.5 release. It introduces new content for recently added features, clarifies existing functionalities, and improves the overall structure and navigability of the documentation for both TiDB Cloud and TiDB Self-Managed users.

Highlights

• Documentation Structure and Content: The Table of Contents for both TiDB Cloud and TiDB Self-Managed documentation has been significantly restructured and expanded. This includes new top-level sections like 'Key Concepts', 'CLI Reference', and 'Support Plan' for TiDB Cloud, and a new 'SQL Reference' section for TiDB Self-Managed. Many existing sections have been reorganized and updated.
• New Feature Documentation: New documentation has been added for C# connectivity, multi-column index optimization, the Index Advisor feature, and various batch processing capabilities (Pipelined DML, non-transactional DML, IMPORT INTO).
• Vector Search Enhancements: Notes and links related to vector search support have been updated and expanded, including new integrations like Amazon Bedrock and details on full-text and hybrid search.
• Database Behavior Clarifications: The documentation for AUTO_INCREMENT and AUTO_RANDOM has been updated to clarify their behavior, including details on MySQL compatibility mode, ID caching, and cache clearing procedures. Information on TiKV MVCC In-Memory Engine (IME) has also been added.
• Administrative and Operational Updates: The OWNERS file has been updated to reflect changes in approver roles. Numerous minor fixes, link updates (including version-specific links), and clarifications have been applied across various documentation files, along with updates to lycheeignore for link checking.

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[gemini-code-assist]

Code Review

The pull request updates the note about vector search support in several markdown files, specifying that the feature is available for TiDB Self-Managed (TiDB >= v8.4) and TiDB Cloud Serverless, but not for TiDB Cloud Dedicated. The changes also convert the link to TiDB Cloud Serverless to a markdown link.

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