message: fix: estimate_fee RPC error msg
diff: @@ -95,7 +95,7 @@ impl ExperimentRpc for ExperimentRpcImpl {
  if fee_rate.as_u64() == 0 {
  return Err(RPCError::custom(
  RPCError::Invalid,
  - "collected samples is not enough, please make sure node has peers and try later"
  + "collected samples are not enough, please make sure the node has peers and try later"
  .into(),
  ));
  }
  