fix errors in full-text search docs

[hfxsd]

Translate the title and content of the Hybrid Search document to Chinese.

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• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
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• v6.1 (TiDB 6.1 versions)
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