Redact s3 api creds

[mnewswanger-cloudflare]

Summary

Use placeholders instead of invalid credentials for R2 docs

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Updated R2 documentation to use placeholders for sensitive API credentials.

• Replaced actual S3 API credentials with placeholders in multiple documentation files.
• Updated endpoint URLs to use a placeholder format for bucket names.

Modified Files

• src/content/docs/r2/buckets/cors.mdx
• src/content/docs/r2/buckets/object-lifecycles.mdx
• src/content/docs/r2/reference/data-location.mdx

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