message: build(aio): fix API docs breadcrumbs
  This also prevents some extra `<a>` elements inserted by the browser's
  trying to fix the HTML structure, which also fixes the `.header-link`
  added in ToC.
  Fixes
  Closes
  PR Close
diff: </script>
  {% for crumb in doc.breadCrumbs %}{% if not loop.last %}
  {$ slash() $}
  - {% if crumb.path %}<a href="{$ crumb.path $}">{$ crumb.text $}<a>{% else %}{$ crumb.text $}{% endif %}
  + {% if crumb.path %}<a href="{$ crumb.path $}">{$ crumb.text $}</a>{% else %}{$ crumb.text $}{% endif %}
  {% endif %}{% endfor %}
  </div>
  <header class="api-header">
  