[doc] link to #Setup-Cluster is broken

[sakaia]

Link from following page
https://docs.seldon.io/projects/seldon-core/en/v1.2.0/examples/tfserving_mnist.html
to following link
https://docs.seldon.io/projects/seldon-core/notebooks/seldon_core_setup.ipynb#Setup-Cluster

But It appeares

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From the source code it seems following code. But It does not appeared in above link.
https://github.com/SeldonIO/seldon-core/blob/v1.2.0/notebooks/seldon_core_setup.ipynb