Fixing the file call in the rfc822.Message replacement example.
diff --git a/Doc/includes/email-headers.py b/Doc/includes/email-headers.py
index edaac23..664c3ff 100644
--- a/Doc/includes/email-headers.py
+++ b/Doc/includes/email-headers.py
@@ -2,7 +2,7 @@
from email.parser import Parser
# If the e-mail headers are in a file, uncomment this line:
-#headers = Parser().parse(messagefile)
+#headers = Parser().parse(open(messagefile, 'r'))
# Or for parsing headers in a string, use:
headers = Parser().parsestr('From: <user@example.com>\n'