Update info metadata

doc/administration/get_started.md

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 stage:
 group:
-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
+info: To determine the technical writer assigned to the Project/Subject associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments-to-other-projects-and-subjects.
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