Documentation: create new merge request permissions
<!--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=15679) </details> <!--IssueSummary end--> According to https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/user/permissions.md neither Guests nor Reporters have access to create merge requests. It also says "On public and internal projects the Guest role is not enforced." From this statement & table, it would see that for public projects, users have Reporter access, and should be unable to create merge requests. Can someone confirm the actual behavior, and update the docs to match?
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