Rewrite Audit section

[sergeymirantis]

We need to re-write the following section on the Audit: https://mirantis.github.io/mke-docs/docs/configuration/kubernetes/kube-apiserver/

I think it requires crosslinks to k8s upstream docs and ellaboration on the precedence of the extraargs

Please apply a SME review.

[quadespresso]

More generally, the improvements should address each of all 4 subsections of this section: https://mirantis.github.io/mke-docs/docs/configuration/kubernetes/

For consideration:

• link to upstream source references
• emphasize using kebab-case (per the upstream refs); do not attempt to convert to camelCase
• call out precedence of using extraArgs, eg, in the event that the user specifies something already explicitly defined in the config YAML
• that extraArgs is intended to be a child of apiServer in the case of kube-apiserver (change as appropriate for each of the other subsections) and not, for example, of audit
• a trivial example (YAML block) to illustrate how one would use extraArgs