MediaUrl is Marked as Mandatory (Create a Message Endpoint)

[NoahConder]

MediaURL is marked as required on the REST API documentation. This causes confusion as the users will believe the endpoint will only serve MMS.

https://developer.signalwire.com/rest/compatibility-api/endpoints/create-message/

Example of a user hitting this issue https://discord.com/channels/994646940774047764/994654275487666216/1417194068819316766