Merge branch 'improve-notes-api-curl-command-readability' into 'master'

Make curl examples more readable in Notes API docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/175881



Merged-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>
Approved-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>
Co-authored-by: Alberto Bignotti <a.bignotti1@gmail.com>