docs: fix preserved-thinking example fields

#64

Use the current OpenAI-compatible Kimi K3 response fields in the preserved-thinking example.

  • Replace max_tokens with max_completion_tokens.
  • Read reasoning output from reasoning_content instead of reasoning.

This mirrors the corresponding fix proposed in MoonshotAI/Kimi-K3 GitHub PR #1 and prevents users from copying an example that uses outdated field names.

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