chore(docs): add horizontal rules between known issues

docs/config/templates/api/api.template.html

@@ -28,7 +28,7 @@ <h1 class="api-profile-header-heading">{$ doc.name $}</h1>
 <h2 id="known-issues">Known Issues</h2>
 {% for issue in doc.knownIssues -%}
 <div class="known-issue">
-  {$ issue | marked $}
+  {$ issue | marked $}  {% if not loop.last %}<hr>{% endif %}
 </div>
 {% endfor -%}
 {% endif %}