docs(plugin-axios,plugin-fetch): document the unwrap() method

[stijnvanhulle]

🎯 Changes

Documents the unwrap() method added to every @kubb/plugin-axios/@kubb/plugin-fetch generated call in kubb-labs/plugins#820. Adds a new "Unwrap the success body" section to the shared calling-operations snippet (used by both plugin pages), showing that unwrap() resolves to the bare success body or rejects with error, while awaiting the call directly still returns the full result.

This documents PR #820 only, kept separate from the returnType option documented in #195.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I am using USA English (serialize, color, center, canceled, analyze, license).
• I ran the humanizer check on any new documentation I wrote.

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https://claude.ai/code/session_012DSVW79h2FdFDkoWWr6PwN

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