Added documentation for Api server LB Certificate

[fernandocarletti]

This feature was added by the PR #5414 and it is available at release 1.10.0 but there's no related documentation yet available.

[mikesplain]

Good catch @fernandocarletti! Thanks so much! I'm not as familiar with the feature, have you tested to ensure it works as you're documenting it?

/ok-to-test

[fernandocarletti]

Hey @mikesplain, yes, I enabled this feature in our production cluster and this configuration example was done based on our working Load Balancer. I did a small QA (since it is our production one) and everything was ok. Kubectl and Kubernetes Dashboard were working as expected.

[mikesplain]

Awesome, thanks @fernandocarletti!

/area documentation
/lgtm
/approve

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