Document how to make changes from latest copy of upstream project / Document how to update fork with latest code from upstream

Problem to solve

If a user is looking to make a change to upstream project it's not clear how to do so using latest copy of upstream if user previously forked project.

Further details

Proposal

• Document how to update fork with latest code from upstream
  • Using GitLab UI
    • Some incomplete details at https://docs.gitlab.com/ee/user/project/repository/forking_workflow.html#repository-mirroring
      • Mirroring mirrors all branch but they might just want latest copy of main branch
    • How to do it using free version?
  • Using Command Line
    • https://stackoverflow.com/questions/7244321/how-do-i-update-or-sync-a-forked-repository-on-github
  • https://forum.gitlab.com/t/refreshing-a-fork/32469/2
• Document how to create new branch from upstream repo w/ all current commits
  • Selecting edit button from upstream repo and making change following workflow results in new branch created in your fork with latest commits
  • Also works from web IDE?
  • Work from create merge request button in issues?

Who can address the issue

Other links/references