resource/aws_organizations_organization: Address PR #8588 feedback
resource/aws_organizations_organization: Address PR #8588 feedback

Output from acceptance testing:

```
    --- PASS: TestAccAWSOrganizations/Organization (84.63s)
        --- PASS: TestAccAWSOrganizations/Organization/EnabledPolicyTypes (34.08s)
        --- PASS: TestAccAWSOrganizations/Organization/FeatureSet (11.33s)
        --- PASS: TestAccAWSOrganizations/Organization/basic (13.29s)
        --- PASS: TestAccAWSOrganizations/Organization/AwsServiceAccessPrincipals (25.93s)
```

terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,Ninir/terraform-provider-aws,Ninir/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws