Docs: Raise minimum K8s version to 1.12
What does this MR do?
As part of upgrading to kubectl 1.13 in #30495 (closed) we also should raise the minimum cluster version, as https://kubernetes.io/docs/setup/release/version-skew-policy/#kubectl means we support 1.12, 1.13 and 1.14
Related issues
Author's checklist
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Follow the Documentation Guidelines and Style Guide. - [-] If applicable, update the permissions table.
- [-] Link docs to and from the higher-level index page, plus other related docs where helpful.
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Apply the documentation label.
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