Description of problem:

I think the example here is incorrect: 

https://docs.openshift.com/container-platform/4.14/networking/cluster-network-operator.html#nw-operator-example-cr_cluster-network-operator 

Cluster Network MTU: is indented too far looking at some other examples and API definition I think it should be:

in API it is at same level as clusterNetwork https://docs.openshift.com/container-platform/4.14/rest_api/config_apis/network-config-openshift-io-v1.html plus another example here:

https://docs.openshift.com/container-platform/4.14/networking/cluster-network-operator.html#nw-cno-view_cluster-network-operator

Think it should be like this: 

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  serviceNetwork:
  - 172.30.0.0/16
  networkType: OVNKubernetes
  clusterNetworkMTU: 8900

Version-Release number of selected component (if applicable):

How reproducible:

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