Update info in metadata

doc/administration/get_started.md

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-stage:
-group:
-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.
+info: For assistance with this TAM Onboarding page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments-to-other-projects-and-subjects.
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 # Get started administering GitLab **(FREE)**