Updated/added a new Comment in Common.yml file

[Vinod08vk]

What type of PR is this? /kind documentation

What this PR does / why we need it: Added a comment in the common.yml file, so that user can understand what needs to be modified and it should be easier for the user

Which issue(s) this PR fixes:

Fixes #559

Test Report Added?: /kind NOT-TESTED

Test Report: NA