message: Update api.tsx text and grammar
  ## Changes
  suggested changes to the Optional Chaining / nested error paragraph
diff: @@ -1211,7 +1211,7 @@ export default {
  <code>{`<input name="username[0].firstName" ref={register} />; \nerrors['username[0].firstName'];`}</code>
  </p>
  <p>
  - we will consider to introduce nested error object once{" "}
  + We will consider migrating to a nested error object once{" "}
  <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining">
  Optional chaining
  </a>{" "}
  