Fix alibaba_cloud_ack_deep_mnist notebook links

Fixes the broken link to docs.

examples/models/alibaba_ack_deep_mnist/alibaba_cloud_ack_deep_mnist.ipynb

@@ -919,7 +919,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "The metrics include requests per second, as well as latency. You are able to add your own custom metrics, and try out other more complex deployments by following furher guides at https://docs.seldon.io/projects/seldon-core/en/latest/workflow/README.html"
+    "The metrics include requests per second, as well as latency. You are able to add your own custom metrics, and try out other more complex deployments by following furher guides at https://docs.seldon.io/projects/seldon-core/en/latest/examples/notebooks.html"
    ]
   },
   {