Update etsi-nfv-descriptors.yang to reflect the correct revisions of the IFA documents.

src/yang/etsi-nfv-descriptors.yang

@@ -14,6 +14,13 @@ module etsi-nfv-descriptors {
   description
     "Network Function Virtualization Descriptors";
 
+  revision 2019-10-01 {
+    description
+      "Version 2.7.1.
+
+       NSD and PNFD according to ETSI GS NFV-IFA 014 Ed271v264
+       VNFD according to ETSI GS NFV-IFA 011 Ed271v264.";
+  }
   revision 2019-04-25 {
     description
       "Initial revision.