fix: small typo

[chenxsan]

I believe it's bundler in https://eips.ethereum.org/EIPS/eip-4337

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PR-Codex overview

This PR standardizes the spelling of "Bundler" across multiple files and updates documentation comments for consistency.

Detailed summary

• Corrected spelling from "Bunder" to "Bundler" in various files and comments
• Updated documentation comments for clarity and consistency

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