Bad quotes in doc

in this page https://solid.inrupt.com/docs/manipulating-ld-with-rdflib,
this quote is used


but this one don’t allow copy/paste, so to facilitate the reuse of the presented code for new users, it would be nice to change all quote to this

so const $rdf = require(‘rdflib’);
become const $rdf = require(‘rdflib’);
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