[TK-1898] Update 'service(_v1)' resource documentation

[arybolovlev]

Description

This PR makes spec.port block optional in the documentation to align with the schema and the provider behavior. The spec.port is optional in the case when spec.type is ExternalName.

Release Note

r/kubernetes_service: make `spec.port` block optional
r/kubernetes_service_v1: make `spec.port` block optional

References

Fix: #1851

Community Note

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