[Translation MR Review follow up] Investigate (/) or \ addition in target files while not being present on source

• follow up from threads:
  • https://gitlab.com/gitlab-com/localization/tech-docs-forked-projects/prod/gitlab/-/merge_requests/104#note_2630431807
  • https://gitlab.com/gitlab-com/localization/tech-docs-forked-projects/prod/gitlab/-/merge_requests/104#note_2630431901
  • https://gitlab.com/gitlab-com/localization/tech-docs-forked-projects/prod/gitlab/-/merge_requests/104#note_2630431913
  • https://gitlab.com/gitlab-com/localization/tech-docs-forked-projects/prod/gitlab/-/merge_requests/104#note_2630431925
• Files:
  • doc-locale/ja-jp/user/gitlab_duo_chat/_index.md
  • doc-locale/ja-jp/user/enterprise_user/_index.md
  • doc-locale/ja-jp/update/versions/gitlab_16_changes.md