fix(fetch): update transport doc for RequestBody type rename

[stijnvanhulle]

🎯 Changes

ResolvedRequest.body in @kubb/plugin-fetch no longer types as the global BodyInit, which a Node-only project (@types/node without the dom lib) doesn't declare. It now uses a module-local RequestBody type. Updates the "Use a custom transport" snippet to match.

See kubb-labs/plugins#839, which fixes the underlying type and issue kubb-labs/plugins#833.

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🟢 +0 new · 🟠 ~1 changed · 🔴 -0 removed · 0 flows · 1 file · commit 00b5cd4

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