Remove 401 AUTHENTICATION_REQUIRED as per commonalities (#66)

Author: benhepworth

code/API_definitions/network-access-management.yaml

@@ -3111,20 +3111,13 @@ components:
                   code:
                     enum:
                       - UNAUTHENTICATED
-                      - AUTHENTICATION_REQUIRED
           examples:
             GENERIC_401_UNAUTHENTICATED:
               description: Request cannot be authenticated
               value:
                 status: 401
                 code: UNAUTHENTICATED
                 message: Request not authenticated due to missing, invalid, or expired credentials.
-            GENERIC_401_AUTHENTICATION_REQUIRED:
-              description: New authentication is needed, authentication is no longer valid
-              value:
-                status: 401
-                code: AUTHENTICATION_REQUIRED
-                message: New authentication is required.
 
     Generic403:
       description: Forbidden