remove coerce optional to nullable for unstable api

Author: fern-support

fern/generators.yml

@@ -24,7 +24,7 @@ api:
         idiomatic-request-names: false
         respect-nullable-schemas: false
         wrap-references-to-nullable-in-optional: true
-        coerce-optional-schemas-to-nullable: true
+        # coerce-optional-schemas-to-nullable: true
         coerce-enums-to-literals: true
   settings:
     path-parameter-order: spec-order