Fix incomplete Usage example: add return button to SendTransaction component

[Meesut0]

Fix incomplete Usage example: add return button to SendTransaction component

Adds missing return with a button to make the SendTransaction example self-contained and consistent with other documentation examples (e.g. this example)

[cursor]

PR Summary

Low Risk
Documentation-only change that adjusts a code sample’s JSX output with no runtime or API behavior impact.

Overview
Fixes the sendTransaction docs usage snippet by adding a missing return that renders a clickable <button> to trigger sendTransaction, making the example self-contained and consistent with other examples.

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