SOL002_104 DELETE Method (on "Threshold") description and response updated

src/SOL002/VNFPerformanceManagement/VNFPerformanceManagement.yaml

@@ -881,6 +881,8 @@ paths:
     delete:
       description: >
         This method allows to delete a threshold.
+        As the result of successfully executing this method, the 
+        "Individual threshold" resource shall not exist any longer.
       parameters:
         - name: Accept
           description: >
@@ -894,7 +896,7 @@ paths:
           description: >
             204 NO CONTENT
 
-            The threshold was deleted successfully.
+            Shall be returned when the threshold was deleted successfully.
             The response body shall be empty.
           headers:
             Version: