Revert "Add s390x platforms for calico" (kubernetes#12989)

* Revert "Add s390x platforms for calico (kubernetes#12616)"

This reverts commit c533563.

* Oxford comma

content/en/docs/setup/independent/create-cluster-kubeadm.md

@@ -285,7 +285,7 @@ Please select one of the tabs to see installation instructions for the respectiv
 {{% tab name="Calico" %}}
 For more information about using Calico, see [Quickstart for Calico on Kubernetes](https://docs.projectcalico.org/latest/getting-started/kubernetes/), [Installing Calico for policy and networking](https://docs.projectcalico.org/latest/getting-started/kubernetes/installation/calico), and other related resources.
 
-For Calico to work correctly, you need to pass `--pod-network-cidr=192.168.0.0/16` to `kubeadm init` or update the `calico.yml` file to match your Pod network. Note that Calico works on `amd64`, `arm64`, `ppc64le` and `s390x` only.
+For Calico to work correctly, you need to pass `--pod-network-cidr=192.168.0.0/16` to `kubeadm init` or update the `calico.yml` file to match your Pod network. Note that Calico works on `amd64`, `arm64`, and `ppc64le` only.
 
 ```shell
 kubectl apply -f https://docs.projectcalico.org/v3.3/getting-started/kubernetes/installation/hosted/rbac-kdd.yaml