docs(route/headers): Fix incorrect link on headers

[Deanmv]

handledatarequest link was a 404 as it has a the trailing .tsx on the URL

[machour]

Thank you @Deanmv, would you mind signing the CLA by adding your GH username to the contributors.yml file? 🙏🏼

[Deanmv]

@machour it is already in there from a previous docs fix (https://github.com/remix-run/remix/blob/main/contributors.yml#L98) Although the casing looks incorrect, does that matter?

Previous PR where I accepted it for reference - #4170

[machour]

Mm, weird, the CLA bot is blocked this time.
Could you try update casing to match?

[changeset-bot]

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[remix-cla-bot]

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

[machour]

Thank you!

[mcansh]

Although the casing looks incorrect, does that matter?

we .toLowerCase() both your username and all contributors in the file, odd that it didn't make it through this time... but i'll keep an eye out if it happens again :)