fix: doc indent fix

[wanziforever]

indent correction for v2 api doc in rating section

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Note

Low Risk
Documentation-only formatting fix to the rating GET example response; no runtime or API behavior changes.

Overview
Fixes indentation in docs/cadt_rpc_api_v2.md so the GET /v2/rating/{id} response example shows ratingValue, ratingLink, and createdAt at the correct JSON nesting level.

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