Fix a bug that the personal-data description is not displayed in docs/home/. (kubernetes#8712)

Author: cstoku

layouts/docs/docsportal_home.html

@@ -26,6 +26,10 @@ <h1>{{ .Title }}</h1>
     {{ $persona_info := $vv }}
     {{ if $persona_info.short_desc }}
     {{ $persona_info.short_desc }}
+    {{ else if $persona_info.glossary_id }}
+    {{ with $persona_info.glossary_id | printf "%s.md" | ($.Site.GetPage "page" "docs/reference/glossary").Resources.GetMatch }}
+    {{ .Params.short_description }}
+    {{ end }}
     {{ end }}
     </div>
     {{ end }}