release function graph in public

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/fg-api-ref.yaml

@@ -1,6 +1,5 @@
 ---
 hc_location: api/functiongraph
-environment: internal
 html_location: docs/fg/api-ref
 link: /function-graph/api-ref/
 pdf_name: fg-api-ref

otc_metadata/data/documents/fg-umn.yaml

@@ -1,6 +1,5 @@
 ---
 hc_location: usermanual/functiongraph
-environment: internal
 html_location: docs/fg/umn
 link: /function-graph/umn/
 pdf_name: fg-umn