docs(tutorial): remove json references

[masious]

This is a simple docs change for the tutorial file.

json function is deprecated in favor of opting into Single Fetch via future.v3_singleFetch and returning raw objects.

This PR attempts to remove this deprecated function from the tutorial file.

[changeset-bot]

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Latest commit: 08bf618

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[remix-cla-bot]

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