themes/docsy/layouts/partials/sidebar-submenu.html

<ul class="sidebar-submenu">
    {{ range .catalog }}

    <li>
        {{if .catalog}}

            {{if .path}}
            <a href="{{ .path }}">{{ .name }}<i class="iconfont icon-arrow-right pull-right"></i></a>
            {{else}}
            <a href="#">{{ .name }}<i class="iconfont icon-arrow-right pull-right"></i></a>
            {{end}}

            {{ partial "sidebar-submenu.html" . }}
        {{else}}
            <a href="{{ .path }}">{{ .name }}</a>
        {{end}}
    </li>

    {{ end }}

</ul>