Doc: variable cilium_ipsec_key must be base64 encoded

[ledroide]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

The variable cilium_ipsec_key had wrong instruction that lead to an error. The value must be base64 encoded.

This paragraph now:

• tells that the value must be base64 encoded
• gives an example to generate the variable the right way

Does this PR introduce a user-facing change?:

Variable cilium_ipsec_key must be base64 encoded

[k8s-ci-robot]

Hi @ledroide. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[yankay]

/ok-to-test

[yankay]

Thanks @ledroide
/approve

[VannTen]

fix #10534

[floryut]

@ledroide Thank you 👍

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, ledroide, yankay

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