String change in Evolution.

["anand muttagi" <avmuttagi gmail com>]

Hi,
    The patch committed replaces the wrong string in mail-notification plugin of  Evolution with the correct string.
i.e It replaces the string " Notifies the user with tray icon and a notify message whenever a new message is arrived " to
" Notifies the user with a notification area and a notification message whenever a new message has arrived " .