Updates churn example to use correct port for UI (#200)

Author: hsubbaraj-spiral

examples/churn_prediction/Build and Deploy Churn Ensemble.ipynb

@@ -3030,7 +3030,7 @@
    "id": "f3cf2bac-cd47-4a5d-826a-8f625b387d1e",
    "metadata": {},
    "source": [
-    "Great, we're done! You can go on over to the Aqueduct UI now at `{your_server_address}:3000`.\n",
+    "Great, we're done! You can go on over to the Aqueduct UI now at `{your_server_address}:8080`.\n",
     "\n",
     "and you should see a new workflow called `Demo Churn Ensemble`. It might take a minute or two to get up and running, but once that's done, you'll be able to click around the different stages of the workflow and see the intermediary results at each stage, trigger new runs, and see previous versions. \n",
     "\n",