Instructions for msg.getAttachmentNames() deprecation are wrong

• User impact:

  Medium
• Similar Issues:

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org.mule.transport.email.MailMuleMessageFactoryTestCase#testAttachments()

uses the deprecated getAttachments(). However, replacing it with getInboundAttachmentNames() as per instructions is not working (attachments end up on the outbound). See if these are doc errors or things go wrong in the Mule message factory.