Documentation: Update r/aws_dynamodb_table server_side_encryption noting DEFAULT encryption type

[ewbankkit]

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Replaces #5637.
Now that Amazon DynamoDB encrypts all customer data at rest, we need to update the aws_dynamodb_table.server_side_encryption documentation to reflect that what the AWS console describes as DEFAULT or AWS owned CMK encryption is equivalent to disabled/not-specified in the API or Terraform.

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