[docs] Bug in documentation for mailbox module

[Luke Maurits]

Hi,

I think I may have found a minor bug in the documentation for the
mailbox module, at:

http://docs.python.org/library/mailbox.html

Right at the beginning of section 18.4.2. ("Message objects"), when
describing the mailbox.Message class, is the following:

"A subclass of the email.Message module’s *Message*. Subclasses of
mailbox.Message add mailbox-format-specific state and behavior."

The word "Message" indicated above with asterisks is a hyperlink to:

http://docs.python.org/library/mailbox.html#mailbox.Message

I think it should instead link to:

http://docs.python.org/library/email.message.html#email.message.Message

Regards,
Luke