title: How to fix "Typo in declared prop type: title" in my React linter?
body: <p>I'm currently using ESLint, Airbnb lint, and Prettier to control code styling. I'm getting an error in the <code>header.propTypes</code> title below. I've looked at the <a href="https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-typos.md" rel="nofollow noreferrer">documentation</a> but I'm not understanding the solution. This is a React project.</p>
  <p>The error is:</p>
  <blockquote>
  <p>Typo in declared prop type: title</p>
  </blockquote>
  <p>What am I doing wrong here?</p>
  <pre><code>export default function Header(props) {
    const { title } = props;
    return (
      &lt;Helmet&gt;
        &lt;title&gt;{title}&lt;/title&gt;
      &lt;/Helmet&gt;
    );
  }
  
  Header.propTypes = {
    title: PropTypes.title.isRequired
  };
  </code></pre>