MMS guide

Added a standalone MMS guide under Connect > SMS, pulling together sending, receiving, and delivery receipts for MMS into one page. The underlying mediaUrls field and webhook behavior were already documented across the Send SMS, Inbound SMS, and Delivery Receipts reference pages — this guide is a single starting point that links out to each, plus a summary of availability (US/Canada only) and the size/URL limits for outbound media.

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• MMS
• Send SMS API reference
• Inbound SMS
• Delivery receipts for outbound SMS