Rollout PDF to public

Reviewed-by: Tino Schreiber <tino.schreiber@t-systems.com>
Co-authored-by: Sebastian Gode <sebastian.gode@telekom.de>
Co-committed-by: Sebastian Gode <sebastian.gode@telekom.de>

otc_metadata/data/documents/ecs-dev.yaml

@@ -3,7 +3,7 @@ hc_location: devg/ecs
 html_location: docs/ecs/dev
 link: /elastic-cloud-server/dev-guide/
 pdf_enabled: true
-pdf_environment: internal
+pdf_environment: public
 rst_location: dev_guide/source
 service_type: ecs
 title: Developer Guide