Add Property.Type to bpdocs template

This field was missing for Property objects that have non-empty inner
Property objects

Bug: 172797653
Test: m soong_docs
Change-Id: Iee9c66f8b85d68a6b5bf18fd9787143191c4f002

cmd/soong_build/writedocs.go

@@ -372,6 +372,7 @@ li a:hover:not(.active) {
     {{if .Properties -}}
       <div class="accordion"  id="{{getModule}}.{{.Name}}">
         <span class="fixed">&#x2295</span><b>{{.Name}}</b>
+        <i>{{.Type}}</i>
         {{- range .OtherNames -}}, {{.}}{{- end -}}
       </div>
       <div class="collapsible">