fix file header description

email_destinations.py

@@ -1,8 +1,8 @@
 #!/usr/bin/python
 #
-# email_stats.py
+# email_destinations.py
 #
-# Time vs date plot for an email mbox file.
+# Emails sent to specified domains as a function of time.
 #
 # Copyright (C) 2015 George C. Privon
 #