Describe the bug

Re the steps in CLOSED_CONTRIBUTIONS.md

• I've run the steps on a "fresh" clone of our https://github.com/nginx/documentation
• I use the URL for the internal-docs repo, and substituted it for
• I get to git checkout internal/main and I get the following error:

error: pathspec 'internal/main' did not match any file(s) known to git

Expected behavior

Your environment

• Default MacOS shell (zsh)

Note: while this is effectively an "internal" issue, we are trying to be as open as possible with our work for this open source repository.