chore(common): comment protobuf message

common/protob/messages-bitcoin.proto

@@ -63,11 +63,11 @@ enum MultisigPubkeysOrder {
  * @embed
  */
 message MultisigRedeemScriptType {
-    repeated HDNodePathType pubkeys = 1;    // pubkeys from multisig address (sorted lexicographically)
+    repeated HDNodePathType pubkeys = 1;    // this field is deprecated and will be removed in the future, use nodes together with address_n instead
     repeated bytes signatures = 2;          // existing signatures for partially signed input
     required uint32 m = 3;                  // "m" from n, how many valid signatures is necessary for spending
-    repeated common.HDNodeType nodes = 4;    // simplified way how to specify pubkeys if they share the same address_n path
-    repeated uint32 address_n = 5;                              // use only field 1 or fields 4+5, if fields 4+5 are used, field 1 is ignored
+    repeated common.HDNodeType nodes = 4;
+    repeated uint32 address_n = 5;          // path to derive pubkeys from nodes
     optional MultisigPubkeysOrder pubkeys_order = 6 [default=PRESERVED]; // order of pubkeys in script pubkey
     /**
     * Structure representing HDNode + Path