<header class="page-header group">
  <div class="hgroup">
    <h1>GOV.UK elements</h1>
    <h2 class="subtitle">The building blocks from which all pages are made</h2>
  </div>
</header>
<header class="page-header group">
  <div class="hgroup">
    <h1>GOV.UK elements</h1>
    <h2 class="subtitle">Layout, typography, colour, images, icons, forms, buttons and data.</h2>
  </div>
</header>

Update subtitle to match service manual header
Update subtitle to match service manual header
