Update mvds.md

mvds.md

@@ -54,13 +54,15 @@ message Payload {
   repeated Message messages = 5004;
 }
 
- message Message {
+message Message {
   bytes group_id = 6001;
   int64 timestamp = 6002;
   bytes body = 6003;
 }
 ```
 
+*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.