lake: incremental updates 0517

[lilin90]

What is changed, added or deleted? (Required)

Added incremental updates till 05/17

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• v9.0 (TiDB 9.0 versions)
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• v6.1 (TiDB 6.1 versions)

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[gemini-code-assist]

Code Review

This pull request introduces documentation for the new Schema Evolution feature in TiDB Cloud Lake, including a comprehensive guide, a tutorial, and updates to relevant SQL reference pages. The review feedback focuses on adhering to the documentation style guide, specifically regarding the use of sentence case for headings, avoiding passive voice, correctly formatting technical terms with backticks, and using lowercase for boolean values in SQL snippets.