SOL002_103 GET Method (on "Threshold") request and response updated

src/SOL002/VNFPerformanceManagement/VNFPerformanceManagement.yaml

@@ -830,9 +830,9 @@ paths:
           description: >
             200 OK
 
-            Information about an individual threshold was queried
-            successfully. The response body shall contain a
-            representation of the threshold.
+            Shall be returned when information about an individual threshold 
+            has been queried successfully. 
+            The response body shall contain a representation of the threshold.
           headers:
             Content-Type:
               description: The MIME type of the body of the response.