docs: fix code examples in route-module.md

[dogxii]

• Fix authMiddleware: remove invalid arrow function syntax from function declaration
• Fix clientMiddleware: remove reference to undefined response variable

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Latest commit: e0b4610

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[Copilot]

Pull request overview

This PR fixes two syntax and logic errors in code examples within the route-module documentation, ensuring the examples are valid and executable.

• Fixed invalid arrow function syntax in authMiddleware function declaration
• Removed reference to undefined response variable in clientMiddleware logging example

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[timdorr]

Thanks!