Fix formating & add needed config for xpack.security.remote_cluster_s…

[SimonKoetting]

Summary

Fix formating & add needed configs for xpack.security.remote_cluster_server.ssl setting when using own certificates

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🔍 Preview links for changed docs

• deploy-manage/security/k8s-transport-settings.md

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💡 Suggestions (1): Optional style improvements. Apply when helpful.

File	Line	Rule	Message
deploy-manage/security/k8s-transport-settings.md	126	Elastic.WordChoice	Consider using 'deactivates, deselects, hides, turns off, makes unavailable' instead of 'Disables', unless the term is in the UI.

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[eedugon]

Great catch @SimonKoetting , thanks for sharing this.

Now that the footnote 3 is getting bigger I'd like to convert it to a note and probably provide some extra background and links for the remote_cluster_client to be better addressed.

Would you mind if I apply a commit to your PR and we can review it together before merging? Or do you prefer if we merge this change and then I create a follow-up PR to update the format of the content a bit?

I'd like to make sure that the reader understands that the remote_cluster_server is used in the destination cluster when configuring Remote Clusters through API key-based authentication.

[SimonKoetting]

@eedugon sound good to me, feel free to add the commit to this PR so we can address this right away :)

[eedugon]

@SimonKoetting , I have commited directly to your branch with a format change, and also included the opposite link: If a user is configuring remote cluster server interface and they are already using certificates created by a third-party tool they should also follow this guidance.

For the example I'm not sure if the current dropdown is a good choice or if we could move the example of RCS+third-party certs to its own sub-section at the end of the document.

@shainaraskas , would you please share your thoughts here? it's a very small PR that covers a small gap that we had in our docs between RCS 2.0 (api key based auth) and ECK not handling transport certs automatically.

The options for the content in deploy-manage/security/k8s-transport-settings.md are:

• Add the needed settings in a note without providing the entire example.
• Add the entire example in a dropdown (current version)
• Add the entire example in its own sub-section at the end.