Merge branch 'docs/mention-jira-deployments-feature' into 'master'

Mention Jira deployments feature in the docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/159994



Merged-by: Ashraf Khamis <akhamis@gitlab.com>
Approved-by: Ashraf Khamis <akhamis@gitlab.com>
Co-authored-by: Anton Smith <asmith@gitlab.com>