Add missing useRouteError import in loader docs

[krystof-k]

Closes: #

• Docs
• Tests

Testing Strategy:

[changeset-bot]

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Latest commit: c4c0ebb

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[remix-cla-bot]

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[brophdawg11]

Thank you for the update - would you mind signing the CLA so we can merge this?

[remix-cla-bot]

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

[krystof-k]

@brophdawg11 Done! Sorry, I wanted to adjust the description etc. and then mark as ready to review, but feel free to merge it.