OVN-K UDN API documentation about Subnets field is outdated [1] bullet (6)
It should be fixed according to [2].


Regarding the example at [1]:
- It Specifics empty JoinSubnets, but it has no affect and should not be mentioned in a reference example in this form.
- The 'Example output' spec misses the second IPv6 subnet.

In general, since each topology (currently layer2, layer3) could have different spec, such as the Subnets field, I think it make more sense having example for each in this doc [1] with explanations for each field.

[1] https://github.com/JoeAldinger/openshift-docs/blob/main/modules/nw-udn-cr.adoc#creating-a-userdefinednetwork-custom-resource    
[2] https://github.com/openshift/openshift-docs/pull/81383/files#r1770537850

4.17    

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