Update links to documentation for router utils

[Johngeorgesample]

Howdy! I was digging into the source this morning and found all the links in packages/router/utils.ts were 404'ing.

[changeset-bot]

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Latest commit: ffc9f93

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[remix-cla-bot]

Hi @Johngeorgesample,

Welcome, and thank you for contributing to React Router!

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- The Remix team

[remix-cla-bot]

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

[brophdawg11]

Thank you for the PR! We actually got alerted to this last week and merged a fix which should be out in a 6.28.0 release later this week 👍