Add specific and actionable review steps for MR collaboration

Clement Horequested to merge
review-examples into master

Add specific and actionable review steps for MR collaboration so that it's clear what needs to be done so that we don't accidentally miss something.

As seen in https://review-examples.about.gitlab.com/handbook/engineering/#collaboration

/cc @jschatz1 @dzaporozhets @sarrahvesselov

Edited by Clement Ho

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