ExAws.S3.put_bucket_cors

You're seeing just the function put_bucket_cors, go back to ExAws.S3 module for more information.
Link to this function

put_bucket_cors(bucket, cors_rules)

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Specs

put_bucket_cors(bucket :: binary(), cors_config :: [map()]) ::
  ExAws.Operation.S3.t()

Update or create a bucket CORS policy