SOL005_6: updated description of a field of NsdInfo datamodel

src/SOL005/NSDManagement/definitions/SOL005NSDescriptorManagement_def.yaml

@@ -104,8 +104,11 @@ definitions:
       archiveSecurityOption:
         description: >
           Signals the security option used by the NSD archive as defined
-          in clause 5.1 of ETSI GS NFV SOL 007.
-          Valid values: OPTION_1, OPTION_2
+          in clause 5.1 of ETSI GS NFV SOL 007. It shall be present after the
+          VNF package content has been on-boarded and absent otherwise.
+          Valid values:
+          - OPTION_1
+          - OPTION_2
         type: string
         enum:
           - OPTION_1