fixed error msg

Co-authored-by: Janez Podhostnik <[email protected]>

access/grpc/grpc.go

@@ -1100,7 +1100,7 @@ func receiveBlockDigestFromClient[Client interface {
  return
  }
 
- sendErr(fmt.Errorf("error receiving blockHeader: %w", err))
+ sendErr(fmt.Errorf("error receiving blockDigest: %w", err))
  return
  }