Merge branch 'jira-cloud-first' into 'master'

Update Jira integration docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/120474



Merged-by: Kati Paizee <kpaizee@gitlab.com>
Approved-by: Kati Paizee <kpaizee@gitlab.com>
Co-authored-by: Ashraf Khamis <akhamis@gitlab.com>