Documentation Revamp

Hi Raphael, I mean that in https://dgraph.io/docs/dql-syntax/dql-mutation/ page, in “set block” you have examples/tabs for json and RDF. I think it would be more useful to show how to do this in Python, Golang or Javascript, as now as a user I need to translate that json example into how the client actually expects a query to be provided. An example would be like the Qdrant docs, that give a python equivalent for each htttp call (Collections - Qdrant)