Fix typos

Author: Seonpyo Kim

core/src/miner/miner.rs

@@ -499,15 +499,15 @@ impl Miner {
 
  let mut tx_count: usize = 0;
  let tx_total = transactions.len();
- let mut invald_tx_users = HashSet::new();
+ let mut invalid_tx_users = HashSet::new();
  for tx in transactions {
  let signer_public = tx.signer_public();
- if invald_tx_users.contains(&signer_public) {
+ if invalid_tx_users.contains(&signer_public) {
  // The previous transaction has failed
  continue
  }
  if !self.is_allowed_transaction(&tx.action) {
- invald_tx_users.insert(signer_public);
+ invalid_tx_users.insert(signer_public);
  invalid_transactions.push(tx.hash());
  continue
  }
@@ -524,7 +524,7 @@ impl Miner {
  // already have transaction - ignore
  Err(Error::History(HistoryError::TransactionAlreadyImported)) => {}
  Err(e) => {
- invald_tx_users.insert(signer_public);
+ invalid_tx_users.insert(signer_public);
  invalid_transactions.push(hash);
  cinfo!(
  MINER,