SOL003_141/SOL003_143: PmSubscriptionRequest and PerformanceReport data types updated

src/definitions/SOL002SOL003VNFPerformanceManagement_def.yaml

@@ -182,7 +182,7 @@ definitions:
                 properties:
                   timeStamp:
                     description: >
-                      Time stamp indicating when the data was collected.
+                      Time stamp indicating when the data has been collected.
                     $ref: "SOL002SOL003_def.yaml#/definitions/DateTime"
                   value:
                     description: >
@@ -415,10 +415,9 @@ definitions:
         format: url
       authentication:
         description: >
-          Authentication parameters to configure the use of Authorization when
-          sending notifications corresponding to this subscription.
-          This attribute shall only be present if the subscriber requires
-          authorization of notifications.
+          Authentication parameters to configure the use of Authorization when sending notifications
+          corresponding to this subscription, as defined in clause 8.3.4 of ETSI GS NFV-SOL 013.
+          This attribute shall only be present if the subscriber requires authorization of notifications.
         $ref: "SOL002SOL003_def.yaml#/definitions/SubscriptionAuthentication"
 
   Threshold: