Merge #11883: replace incorrect call to sendmail with correct call to send_message

Doc/includes/email-simple.py

@@ -19,5 +19,5 @@ msg['To'] = you
 
 # Send the message via our own SMTP server.
 s = smtplib.SMTP()
-s.sendmail(msg)
+s.send_message(msg)
 s.quit()