Fix replacement URL for React getting started

[MrChrisW]

Changed

The existing link shown with the deprecation banner on https://primer.style/react/getting-started points to https://primer.style/design/guides/development/react which is incorrect and results in a 404 not found.

This updates the replacement URL to the correct value of https://primer.style/guides/react ✨

Rollout strategy

• None; if selected, include a brief description as to why

Merge checklist

• Added/updated documentation

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Latest commit: 9368af2

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	88.24 KB (0%)
packages/react/dist/browser.umd.js	88.68 KB (0%)

[joshblack]

Thanks for this!