Merge branch 'update-metadata-on-dora-pages' into 'master'

Update metadata on DORA pages

See merge request gitlab-org/gitlab!71708

doc/api/dora/metrics.md

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-stage: Release
-group: Release
+stage: Manage
+group: Optimize
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 type: reference, api
 ---

doc/api/dora4_project_analytics.md

 ---
-stage: Release
-group: Release
+stage: Manage
+group: Optimize
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 type: reference, api
 ---