Dynamically generate a heading for Extension Docs API pages

chrome/common/extensions/api/management.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace":"management",
+    "description": "The <code>chrome.management</code> module provides ways to manage the list of extensions/apps that are installed and running. It is particularly useful for extensions that <a href='override.html'>override</a> the built-in New Tab page.",
     "types": [
       {
         "id": "IconInfo",
         "description": "Information about an icon belonging to an extension, app, or theme.",
         "type": "object",
         "properties": {
           "size": { "type": "integer", "description": "A number representing the width and height of the icon. Likely values include (but are not limited to) 128, 48, 24, and 16."  },
           "url": { "type": "string", "description": "The URL for this icon image. To display a grayscale version of the icon (to indicate that an extension is disabled, for example), append <code>?grayscale=true</code> to the URL." }
         }
       },
@@ skipping 303 matching lines @@
       },
       {
         "name": "onDisabled",
         "description": "Fired when an app or extension has been disabled.",
         "type": "function",
         "parameters": [{"name": "info", "$ref":"ExtensionInfo"}]
       }
     ]
   }
 ]