[docs] Bug in email example

[Doug Carter]

On the page:

  http://docs.python.org/library/email-examples.html

At the bottom, under the heading:

  Here's an example of how to create an HTML message with an alternative
  plain text version:

In the code sample, the import from lines are incorrect:

  from email.mime.multipart import MIMEMultipart
  from email.mime.text import MIMEText

They should be:

  from email.MIMEMultipart import MIMEMultipart
  from email.MIMEText import MIMEText


Best,

Doug Carter