Doc: Tag examples

[noredistribution]

Change Summary

Added examples on how to create, delete, assign and unassign both interface and device tags

Related Issue(s)

Fixes #517

Component(s) name

arista.cvp.<module-name>

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)