[Minor] Documentation mentions "Structured JSON" instead of "Nested JSON"

The documentation mentions “structured JSON” in several places like Quick Start Guide on JSON, JSON File Format and so on. I believe that the more proper term would be “nested JSON” instead as there is no set “structure” per se, but that feature only allows the user to upload nested JSON files.
Also, this would be backed up by the way how other TMS companies use this term, for example: