Address S3 Express FIXMEs

[ewbankkit]

There are some FIXMEs in the S3 service code after merging the Amazon S3 Express functionality -- #34612. Address them
Also update documentation: #34612 (comment).

[github-actions]

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[ewbankkit]

aws_s3_object testing HTTP 500s instead of BucketNotFound still TODO.

[github-actions]

This functionality has been released in v5.31.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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