Add the possibility to show all questions of a group as one + documentation update

assets/layers/charging_station/charging_station.json

@@ -3384,6 +3384,12 @@
       "render": {
         "en": "<h3>Technical questions</h3>The questions below are very technical. Feel free to ignore them<br/>{questions}",
         "nl": "<h3>Technische vragen</h3>De vragen hieronder zijn erg technisch - sla deze over indien je hier geen tijd voor hebt<br/>{questions}"
+      },
+      "freeform": {
+        "key": "questions",
+        "helperArgs": {
+          "showAllQuestions": true
+        }
       }
     }
   ],