docs: Update useFetcher to include mention of JSON data

[ttsirkia]

Add mention that any JSON data can be submitted with useFetcher.

Improves documentation as explained here #1959 (reply in thread)

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Latest commit: a261883

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[remix-cla-bot]

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

[brophdawg11]

Thanks!