code: def all(cls, client, symbols):
          
          fetch data for multiple stocks
          """
          params = {"symbol": ",".join(symbols)}
          request_url = "https://api.robinhood.com/instruments/"
  
          data = client.get(request_url, params=params)
          results = data["results"]
  
          while data["next"]:
              data = client.get(data["next"])
              results.extend(data["results"])
          return results
docs: fetch data for multiple stocks