Add pdf environment switch

Reviewed-by: Gode, Sebastian <sebastian.gode@t-systems.com>
Co-authored-by: tischrei <tino.schreiber@t-systems.com>
Co-committed-by: tischrei <tino.schreiber@t-systems.com>

otc_metadata/data/documents/cse-api-ref.yaml

@@ -3,7 +3,8 @@ hc_location: api/cse
 environment: internal
 html_location: docs/cse/api-ref
 link: /cloud-service-engine/api-ref/
-pdf_name: cse-api-ref
+pdf_enabled: true
+pdf_environment: internal
 rst_location: api-ref/source
 service_type: cse
 title: API Reference