message: update triggerValidation example
diff: @@ -7,13 +7,11 @@ export default function App() {
  return (
  <form>
  + <input name="firstName" ref={register({ required: true })} />
  <input name="lastName" ref={register({ required: true })} />
  - <button
  - type="button"
  - onClick={() => { triggerValidation("lastName"); }}
  - >
  - Trigger
  - </button>
  + <button type="button" onClick={() => { triggerValidation("lastName"); }}>Trigger</button>
  + <button type="button" onClick={() => { triggerValidation(["firstName", "lastName"]); }}>Trigger Multiple</button>
  + <button type="button" onClick={() => { triggerValidation(); }}>Trigger All</button>
  <button
  type="button"
  onClick={async () => {
  @@ -21,7 +19,7 @@ export default function App() {
  if (result) { console.log('valid input') }
  }}
  >
  - Trigger
  + Trigger with result
  </button>
  </form>
  );
  