Remove "added" from version history items

doc/administration/admin_area.md

doc/administration/audit_event_streaming/examples.md

doc/administration/integration/mailgun.md

doc/ci/yaml/artifacts_reports.md

doc/user/analytics/dora_metrics.md

doc/user/application_security/iac_scanning/index.md

doc/user/application_security/sast/customize_rulesets.md

doc/user/application_security/secret_detection/index.md

doc/user/application_security/vulnerability_report/index.md

doc/user/award_emojis.md

doc/user/compliance/compliance_center/index.md

doc/user/project/merge_requests/commit_templates.md

doc/user/project/milestones/burndown_and_burnup_charts.md

doc/user/project/requirements/index.md