Merge branch 'acook/fix_completion_examples_uri' into 'master'

Ensure examples file is opened from Rails.root

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/134691



Merged-by: Stan Hu <stanhu@gmail.com>
Approved-by: Stan Hu <stanhu@gmail.com>
Co-authored-by: Allen Cook <acook@gitlab.com>