Merge branch 'msj-markdown-images-code' into 'master'

Update doc on pasting Markdown images

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154259



Merged-by: Himanshu Kapoor <info@fleon.org>
Co-authored-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>