update docs to explicitly state TLS termination location

[tylerbrewer2]

What this PR does / why we need it:

Adds explicit note to the docs about TLS termination compatibility. I've seen some other questions about this (I had the question myself), so I figured it might be good to callout explicitly.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: tylerbrewer2 / name: Tyler Brewer (8b1e921)

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[k8s-ci-robot]

Hi @tylerbrewer2. Thanks for your PR.

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[strongjz]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: strongjz, tylerbrewer2

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