message: [Client] Fix typo in error message
diff: @@ -44,7 +44,7 @@ impl Mnemonic {
  mnemonic.push(WORDS[idx]);
  } else {
  return Err(WalletError::LibraWalletGeneric(
  - "Mneminic contains an unknown word".to_string(),
  + "Mnemonic contains an unknown word".to_string(),
  ));
  }
  }
  