docs(how-to/spa): remove duplicated text

[HelpMe-Pls]

There's a <docs-info> tag below with the EXACT same content.

[changeset-bot]

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Latest commit: 84fa28a

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[remix-cla-bot]

Hi @HelpMe-Pls,

Welcome, and thank you for contributing to React Router!

Before we consider your pull request, we ask that you sign our Contributor License Agreement (CLA). We require this only once.

You may review the CLA and sign it by adding your name to contributors.yml.

Once the CLA is signed, the CLA Signed label will be added to the pull request.

If you have already signed the CLA and received this response in error, or if you have any questions, please contact us at hello@remix.run.

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[MichaelDeBoey]

This seems to be intentionally done by @brookslybrand in #13005

[brophdawg11]

@HelpMe-Pls Could you sign the CLA?

[brookslybrand]

Oh yeah, that is a little silly

@HelpMe-Pls if you'll sign the CLA we can go ahead and merge this :)

edit: jinx @brophdawg11

[remix-cla-bot]

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

[HelpMe-Pls]

Ah @brookslybrand, you're the guy who made the tutorial video!
Tysm for making react-router more accessible for people like me.

[timdorr]

Thanks!