Removes link to deprecated ChoiceFieldset component from docs

[mperrotti]

@andrialexandrou spotted a place in the docs where we were still linking to the deprecated ChoiceFieldset component. This removes that link and references RadioGroup and CheckboxGroup instead.

Merge checklist

• [n/a] Added/updated tests
• [x] Added/updated documentation
• [x] Tested in Chrome
• [ ] Tested in Firefox
• [ ] Tested in Safari
• [ ] Tested in Edge

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Latest commit: d18f3a9f12b7ed5b9c95c5a1a1db689632f4e2f6

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size-limit report 📦

Path	Size
dist/browser.esm.js	72.96 KB (0%)
dist/browser.umd.js	73.33 KB (0%)