Update metadata for Integrations docs

doc/administration/system_hooks.md

doc/api/api_resources.md

doc/api/graphql/getting_started.md

doc/api/graphql/index.md

doc/api/graphql/removed_items.md

doc/api/index.md

doc/api/integrations.md

doc/api/openapi/openapi_interactive.md

doc/api/system_hooks.md

doc/development/fe_guide/view_component.md

doc/development/graphql_guide/graphql_pro.md

doc/development/graphql_guide/index.md

doc/development/graphql_guide/monitoring.md

doc/development/graphql_guide/pagination.md

doc/development/integrations/index.md

doc/development/integrations/jenkins.md

doc/development/integrations/jira_connect.md

doc/integration/datadog.md

doc/integration/external-issue-tracker.md

doc/integration/gmail_action_buttons_for_gitlab.md