Update audit configuration description

[soltysh]

With k8s 1.4 we switched to using upstream audit mechanics, which gave us a few additional options. I've updated the description with those new options.

@ahardin-rh ptal

[ahardin-rh]

@soltysh Is it accurate to say that self means the user's self?

[soltysh]

It's basically himself. When you're not using --as flag you're acting as yourself, this is when self will show up here, which is most of the time. When you do specify --as flag for any command this will be the username which you specified as the flag value. I hope that makes sense :)

[ahardin-rh]

@soltysh Thank you! I can do some minor style edits in a follow-up PR.

[ahardin-rh]

[rev_history]
|xref:../install_config/master_node_configuration.adoc#install-config-master-node-configuration[Master and Node Configuration]
|Updated the xref:../install_config/master_node_configuration.adoc#master-node-config-audit-config[Audit Configuration] section description and added Audit Configuration Parameters.
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