config: Update example config file

config.json.dist

@@ -1,13 +1,18 @@
 {
     "octranspo": {
-        "appId": "",
-        "apiKey": "",
+        "appId": "xxx",
+        "apiKey": "xxx",
         "busNo": 0,
         "stopNo": 0
     },
     "navitia": {
-        "token": "",
-        "stopId": ""
+        "token": "xxx",
+        "stopId": "EX123"
+    },
+    "gtfs": {
+        "secret": "xxx",
+        "endpoint": "https://example.org/api/",
+        "stopId": "EX123"
     }
 }