Merge branch 'msj-planning-analytics-metadata' into 'master'

Change metadata of issue analytics doc

See merge request gitlab-org/gitlab!67879

doc/user/group/issues_analytics/index.md

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 type: reference
-stage: Manage
-group: Optimize
+stage: Plan
+group: Project Management
 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
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