Tuple Specification is inconsistent with Terraform

Terraform says that Tuple elements [shall be separated by comma](https://developer.hashicorp.com/terraform/language/expressions/types#lists-tuples), while the [HCL specs allows NewLine](https://github.com/hashicorp/hcl/blob/main/hclsyntax/spec.md#collection-values) as a separator as well.

Compare the Terraform tuple documentation with the HCL syntax specification linked in the issue, focusing on the permitted separators. Determine which documentation needs clarification or correction, and consider the work complete when both references describe the same tuple syntax consistently.

Written by the indexing model from the issue text.