Metadata Docs - reference JSON instead of XML

While doing !437 (merged) I saw all the entries with:

This is converted to (<XXXXXXX>) in the XML file (_index.xml_).

...but Translation does not exist in (the older?) index.xml and we should use the newer JSON instead, right?

So, we need to replace all those lines with This is converted to (XXXXXXXXXX) in the JSON file (_index.json_). ?

Did I get this right?

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