release-8.5: fix broken links in AI docs

[qiancai]

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As stated in the title

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[gemini-code-assist]

Code Review

This pull request corrects the URL path to the LlamaIndex sample code and Colab notebook in the TiDB Vector Search integration tutorial by removing a duplicate 'docs/' directory segment. There are no review comments, and I have no feedback to provide.

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[qiancai]

/approve

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