Add hint about "replace" in "useNavigate" documentation

[Elanis]

When reading the v6 doc I noticed there were no mention of what "replace" is used for on the "useNavigate" page. This PR fixes this issue.

[changeset-bot]

⚠️ No Changeset found

Latest commit: f81f45a

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[remix-cla-bot]

Hi @Elanis,

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[remix-cla-bot]

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

[timdorr]

Thanks!

[Elanis]

No problem ;)