Doc change: add schema.org metadata.

Change-Id: I17a799ff812eb66b647f26040f12ad0f651bd471
diff --git a/res/assets/templates/nosidenavpage.cs b/res/assets/templates/nosidenavpage.cs
index 1dec41e..b9272d9 100644
--- a/res/assets/templates/nosidenavpage.cs
+++ b/res/assets/templates/nosidenavpage.cs
@@ -2,7 +2,7 @@
 <?cs include:"macros.cs" ?>
 <html>
 <?cs include:"head_tag.cs" ?>
-<body class="gc-documentation">
+<body class="gc-documentation" itemscope itemtype="http://schema.org/Article">
 <a name="top"></a>
 <?cs call:custom_masthead() ?>