docs: "How Terraform Uses Unicode" should mention HCL too #32231
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I missed this on my first attempt to write this document. Consequently we're currently depending on a version of HCL which uses Unicode 9, and that's significantly lagging behind everything else which is currently on Unicode 13.
My goal of adding these docs then is to remind us to update HCL to Unicode 15 once we're updating everything else to Unicode 15 with the Go 1.20 release, assuming that the Go team completes that Unicode upgrade as currently planned (golang/go#55079).