Update message.mdx to remove optional parameters info

Author: onerandomusername

docs/resources/message.mdx

@@ -929,10 +929,6 @@ Any provided files will be **appended** to the message. To remove or replace fil
 Starting with API v10, the `attachments` array must contain all attachments that should be present after edit, including **retained and new** attachments provided in the request body.
 :::
 
-:::info
-All parameters to this endpoint are optional and nullable.
-:::
-
 ###### JSON/Form Params
 
 | Field            | Type                                                                      | Description                                                                                                                         |