Change environment to PUBLIC

Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: Boka, Ladislav <ladislav.boka@t-systems.com>
Co-committed-by: Boka, Ladislav <ladislav.boka@t-systems.com>

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

@@ -1,6 +1,6 @@
 ---
 hc_location: api/ddm
-environment: internal
+environment: public
 html_location: docs/ddm/api-ref
 link: /distributed-database-middleware/api-ref/
 pdf_name: ddm-api-ref

otc_metadata/data/documents/ddm-umn.yaml

@@ -1,6 +1,6 @@
 ---
 hc_location: usermanual/ddm
-environment: internal
+environment: public
 html_location: docs/ddm/umn
 link: /distributed-database-middleware/umn/
 pdf_name: ddm-umn

otc_metadata/data/services/ddm.yaml

@@ -1,5 +1,5 @@
 ---
-environment: internal
+environment: public
 repositories:
 - environment: internal
   repo: docs/distributed-database-middleware