Backport of docs: Updates k8s annotation docs into release/1.12.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #13809 to be assessed for backporting due to the inclusion of the label backport/1.12.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

The below text is copied from the body of the original PR.

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Updates k8s annotation docs for the options added in hashicorp/consul-k8s#1315.

Description

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Testing & Reproduction steps

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PR Checklist

• updated test coverage
• external facing docs updated
• not a security concern

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[david-yu]

Duplicate backport