Dropdown to choose versions to compare in MR is not helpful
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=22053) </details> <!--IssueSummary end--> ### Description When trying to review a partial diff in an MR that includes several commits, this dropdown is all we have: ![Captura_de_pantalla_de_2018-04-27_08-20-46](/uploads/2e2336dbb6b440c244af42ddcf2425b5/Captura_de_pantalla_de_2018-04-27_08-20-46.png) The problem is that I never created such versions, and I also cannot remember which commit SHA refers to which change. ### Proposal The dropdown is OK, but it needs to include more human-friendly info, such as: - Author avatar/name - Commit message
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