Minor changes.

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

transfer_service/retrieve_executor.py

@@ -406,7 +406,7 @@ class RetrieveExecutor(TaskExecutor):
         Owner ID: {self.jobObj.ownerId}
 
         Your files are available and can be downloaded.
-        Here below is attached a file containing the URL list of all the VOSpace data nodes.
+        A file containing the list of URLs is attached here below.
 
         """
                 m.setMessageWithAttachment("VOSpace data retrieve notification: COMPLETED", msg, urlListFilePath + ".tar.gz")