docs: 10-form-vs-fetcher code blocks formatting

[KarelVerschraegen]

Error was added in the following commit d828b44

Seems like the formatter bot added an extra slash which is also not needed ed12d8d

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[remix-cla-bot]

Hi @KarelVerschraegen,

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[remix-cla-bot]

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

[MichaelDeBoey]

Thanks for opening this PR! 🙏

However, I'm going to close this as this is already fixed by #7191