Update mvds.md

mvds.md

@@ -61,6 +61,8 @@ message Payload {
 }
 ```
 
+*The payload field numbers are kept more "unique" to ensure no overlap with other protocol buffers.*
+
 Each payload contains the following fields:
 
 - **Acks:** This field contains a list (can be empty) of `message identifiers` informing the recipient that sender holds a specific message.