fix(docs): menu Z->A sort order

Fixes issue with using Docs layout for sections that need reverse menu sorting, such as updates (v5, v4.9, ..).

Affected Docs site prior to conversion to Books layout.

layouts/partials/docs_sidebar.html

@@ -29,10 +29,13 @@
   {{ with (index site.Menus $menu_name) }}
 
   {{/* Enable Updates layout to order by descending version name. */}}
-  {{ $menu := (index site.Menus $menu_name).ByWeight }}
+  {{ $menu := (index site.Menus $menu_name) }}
   {{ if eq ($.Scratch.Get "docs_menu_sort" | default "weight") "name_reverse" }}
-    {{ $menu = (index site.Menus $menu_name).ByName.Reverse }}
+    {{ $menu = sort $menu "Title" "desc" }}
+  {{ else }}
+    {{ $menu = $menu.ByWeight }}
   {{end}}
+
   {{ range $menu }}
   <div class="docs-toc-item{{ if $current_page.IsMenuCurrent $menu_name . }} active{{ end }}">
     <a class="docs-toc-link" {{ if .URL }}href="{{ .URL }}"{{else if .HasChildren }}href="{{ (index .Children 0).URL }}"{{end}}>{{ .Name }}</a>
@@ -43,6 +46,7 @@
       <li {{ if $current_page.IsMenuCurrent $menu_name . }}class="active"{{ end }}>
         <a href="{{ .URL }}">{{ .Name }}</a>
       </li>
+
       {{ end }}
     </ul>
     {{ end }}