W-20283303-email-connector-updates-kt

[kevintroller]

…P flows, TLS setup

• Add 'Understanding Attachments' section: when to use fixed vs dynamic attachments, and that Attachments parameter expects a DataWeave expression (map), not Java or raw JSON; clarify contentType behavior
• Add 'Configuring TLS: Truststore and Keystore': where to find/create truststore and keystore, keytool examples, path resolution, when each is needed
• Add example: send PDF, Word, and JSON from REST API multipart to support
• Add example: poll SFTP directory and email files as attachments
• Fix Send Attachment XML: use payload instead of literal 'payload'
• Fix typo: trustore -> truststore

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