Add Merge Request Commits keyboard shortcuts c and x to shortcuts help page
<!--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=292053) </details> <!--IssueSummary end--> Add Merge Request Commits keyboard shortcuts c and x to https://docs.gitlab.com/ee/user/shortcuts.html I ended up on that page when searching for shortcuts to next and previous commit and didn't find what I was looking for. I think in general you need a process for updating the shortcuts.html page when you are adding shortcuts so people can know about them. Adding a tooltip to the buttons showing the shortcut, would be even better.
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