message: Meta: Improve copy around personal access token in the options
diff: <form id="options-form" class="detail-view-container">
  <p>
  <label>
  - <strong>Personal token</strong>, <a id="personal-token-link" href="https://github.com/settings/tokens/new?description=Refined%20GitHub&scopes=repo" target="_blank">found here</a> (<a href="https://github.com/sindresorhus/refined-github/search?q=libs/api" target="_blank">some features</a> use the API)<br>
  + <strong>Personal token</strong> <sup>(optional)</sup><br>
  + <a href="https://github.com/sindresorhus/refined-github/search?q=libs/api" target="_blank">Some features</a> may not work without it.
  + <a id="personal-token-link" href="https://github.com/settings/tokens/new?description=Refined%20GitHub&scopes=repo" target="_blank">Generate one</a>.
  <!-- placeholder is set to enable use of :placeholder-shown CSS selector -->
  <input type="text" name="personalToken" spellcheck="false" autocomplete="off" pattern="[\da-f]{40}" placeholder=" ">
  </label>
  