Add version_id attribute for aws_s3_bucket_object documentation

[hanninen]

I wanted to use the s3_object_version argument in the aws_lambda_function resource (https://www.terraform.io/docs/providers/aws/r/lambda_function.html#s3_object_version), but I could not find any documentation on how to retrieve the version ID of an S3 object in terraform.

I looked at the source code and discovered the version_id field from there and tested that it works as an attribute for the aws_s3_bucket_object resource. I could not see from the code directly is the version_id attribute correctly exported already or does it need some changes in the code still. Could you doublecheck that and if it is OK as it is, here is the small docs update to add the version_id attribute.

[catsby]

I think this looks good, thanks! Version here was added in #5305 it looks like we just forgot to update documentation that it was exported

[ghost]

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