chore: update isRouteErrorResponse description

[ttys026]

• update description about isRouteErrorResponse, it has nothing to do with status code.

related: remix-run/remix#10016

[changeset-bot]

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[remix-cla-bot]

Hi @ttys026,

Welcome, and thank you for contributing to React Router!

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[remix-cla-bot]

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

[timdorr]

Thanks!