Local development warning for S3 APIs

[nchudleigh]

Summary

Add a note to the docs letting the reader know that connecting to an R2 bucket this way is not possible when it's running locally in emulation mode with Wrangler Dev.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Added a warning regarding the limitations of connecting to R2 buckets in local emulation mode with Wrangler Dev.

• Included a note in the documentation about the inability to connect to R2 buckets while using the wrangler dev command.
• Clarified the requirement for R2 configuration credentials when using the @aws-sdk/client-s3 package.

Modified Files

• src/content/docs/r2/examples/aws/aws-sdk-js-v3.mdx

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