add VolView docs link

Author: fedorov

notebooks/getting_started/part3_exploring_cohorts.ipynb

@@ -833,7 +833,9 @@
       "source": [
         "You can open multiple series by passing the list of bucket folders in the URL:\n",
         "\n",
-        "https://volview.kitware.app/?urls=[s3://idc-open-data/262f1166-22e1-4eed-a2fe-c899e995640c,s3://idc-open-data/48a29c97-bb71-4f8f-b70b-688f36bca0c1]"
+        "https://volview.kitware.app/?urls=[s3://idc-open-data/262f1166-22e1-4eed-a2fe-c899e995640c,s3://idc-open-data/48a29c97-bb71-4f8f-b70b-688f36bca0c1]\n",
+        "\n",
+        "You can learn more about VolView URL parameterization in this documentation article: https://kitware.github.io/VolView/doc/loading_data.html#Loading-Remote-Data-via-URLs"
       ],
       "metadata": {
         "id": "SSNXGczneqMw"