activate pdf for CSS service

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/css-api-ref.yaml

@@ -2,7 +2,7 @@
 hc_location: api/css
 html_location: docs/css/api-ref
 link: /cloud-search-service/api-ref/
-pdf_enabled: false
+pdf_enabled: true
 pdf_environment: internal
 rst_location: api-ref/source
 service_type: css