docs: remove outdated ciphers

[xlanor]

This is just a small documentation update that I ran into while deploying an update from 2.10.1 to 2.13.1

This updates the documentation in the operator manual to remove the outdated ciphers as per #17569

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
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[blakepettersson]

Thanks!