Update website/docs/d/odb_cloud_exadata_infrastructure.html.markdown

fix linting issue in the doc.

Co-authored-by: Adrian Johnson <[email protected]>

Author: ab-cs13

website/docs/d/odb_cloud_exadata_infrastructure.html.markdown

@@ -69,4 +69,4 @@ This data source exports the following attributes in addition to the arguments a
 * `database_server_type` - The database server model type of the Exadata infrastructure. For the list of valid model names, use the ListDbSystemShapes operation.
 * `storage_server_type` - The storage server model type of the Exadata infrastructure. For the list of valid model names, use the ListDbSystemShapes operation.
 * `maintenance_window` - The scheduling details of the maintenance window. Patching and system updates take place during the maintenance window.
-* `region` -  Region where this resource will be [managed](https://docs.aws.amazon.com/general/latest/gr/rande.html#regional-endpoints). Defaults to the Region set in the [provider configuration](https://registry.terraform.io/providers/hashicorp/aws/latest/docs#aws-configuration-reference).
+* `region` - (Optional) Region where this resource will be [managed](https://docs.aws.amazon.com/general/latest/gr/rande.html#regional-endpoints). Defaults to the Region set in the [provider configuration](https://registry.terraform.io/providers/hashicorp/aws/latest/docs#aws-configuration-reference).