Update navigation.html

role attribute not needed because ARIA already recognizes `<ul>` as a list.

Author: damli40

doc/_templates/navigation.html

@@ -8,7 +8,7 @@ <h3>{{ _('Table of Contents') }}</h3>
 {{ toctree(includehidden=theme_sidebar_includehidden, collapse=theme_sidebar_collapse) }}
 {% if theme_extra_nav_links %}
 <hr />
-<ul role="list">
+<ul>
     {% for text, uri in theme_extra_nav_links.items() %}
     <li class="toctree-l1"><a href="{{ uri }}">{{ text }}</a></li>
     {% endfor %}