[R2] Document US jurisdiction

[rdimaio]

Summary

Documents the generally available us jurisdiction for R2.

• Adds US to supported jurisdiction and endpoint references.
• Updates Snowflake recommendations for US regions.
• Adds a changelog with S3 and Workers examples.

Documentation checklist

• Is there a changelog entry (guidelines)?
• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit b835ced.

Code Review

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Conventions

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[rdimaio]

/full-review

[rdimaio]

/review