Doc(cv_change_control_v3): add actions documentation

[noredistribution]

Change Summary

added more details about CC actions

Related Issue(s)

Fixes #670

Component(s) name

arista.cvp.cv_change_control_v3

Proposed changes

How to test

Checklist

User Checklist

• N/A

Repository Checklist

• [x ] My code has been rebased from devel before I start
• [x ] I have read the CONTRIBUTING document.
• [x ] My change requires a change to the documentation and documentation have been updated accordingly. (check the box if not applicable)
• [ ] I have updated molecule CI testing accordingly. (check the box if not applicable)