[1.2.X] Fixed #15163 - typo in email docs; thanks metal for the report.

two different sets of recipients; however, only one connection to the

mail server would be opened::

    message1 = ('Subject here', 'Here is the message', 'from@example.com, ['first@example.com', 'other@example.com'])

    message1 = ('Subject here', 'Here is the message', 'from@example.com', ['first@example.com', 'other@example.com'])

    message2 = ('Another Subject', 'Here is another message', 'from@example.com', ['second@test.com'])

    send_mass_mail((message1, message2), fail_silently=False)