Update docs redirects 2021-12-09

doc/administration/geo/replication/updating_the_geo_nodes.md

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doc/api/services.md

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doc/development/event_tracking/backend.md

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doc/development/event_tracking/frontend.md

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doc/development/event_tracking/index.md

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doc/development/fe_guide/event_tracking.md

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doc/development/product_analytics/event_dictionary.md

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doc/development/product_analytics/index.md

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doc/development/service_ping/dictionary.md

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doc/development/usage_ping/dictionary.md

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doc/intro/index.md

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doc/user/admin_area/approving_users.md

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doc/user/compliance/compliance_dashboard/index.md

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doc/user/infrastructure/mr_integration.md

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doc/user/infrastructure/terraform_state.md

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