note: add nondeterministic note to events (#6220) (#6225)

## Description

Since events are not hashed into the header they can be non deterministic. Changing an event is not consensus breaking. Will update docs in the spec

(cherry picked from commit 884d4d5)

Co-authored-by: Marko <marbar3778@yahoo.com>

proto/tendermint/abci/types.proto

@@ -222,7 +222,7 @@ message ResponseDeliverTx {
   int64          gas_wanted = 5 [json_name = "gas_wanted"];
   int64          gas_used   = 6 [json_name = "gas_used"];
   repeated Event events     = 7
-      [(gogoproto.nullable) = false, (gogoproto.jsontag) = "events,omitempty"];
+      [(gogoproto.nullable) = false, (gogoproto.jsontag) = "events,omitempty"]; // nondeterministic
   string codespace = 8;
 }
 

types/block.go

@@ -342,6 +342,7 @@ type Header struct {
 	ConsensusHash      tmbytes.HexBytes `json:"consensus_hash"`       // consensus params for current block
 	AppHash            tmbytes.HexBytes `json:"app_hash"`             // state after txs from the previous block
 	// root hash of all results from the txs from the previous block
+	// see `deterministicResponseDeliverTx` to understand which parts of a tx is hashed into here
 	LastResultsHash tmbytes.HexBytes `json:"last_results_hash"`
 
 	// consensus info