Clarify complement description in openapi_v2.en.yaml

Author: edgtz

website/openapi_v2.en.yaml

@@ -11169,7 +11169,7 @@ components:
         complement:
           type: string
           format: xml
-          description: XML code of your complement.
+          description: XML code of your concept-level complement.
         third_party:
           allOf:
             - type: object
@@ -11219,7 +11219,7 @@ components:
         complement:
           type: string
           format: xml
-          description: XML code of your complement.
+          description: XML code of your concept-level complement.
         third_party:
           allOf:
             - type: object
@@ -11256,7 +11256,7 @@ components:
         complement:
           type: string
           format: xml
-          description: XML code of your complement.
+          description: XML code of your concept-level complement.
         parts:
           type: array
           items: