Dynamically generate a heading for Extension Docs API pages

chrome/common/extensions/api/webstore.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": "webstore",
+    "description": "Use the <code>chrome.webstore</code> module to initiate app and extension installations \"inline\" from your site.",
+    "availability": "15",
 
     // Any webpage can use the webstore API.
     "matches": [ "http://*/*", "https://*/*" ],
 
     // Hosted apps can use the webstore API from within a blessed context.
     "uses_feature_system": true,
     "channel": "stable",
     "extension_types": ["hosted_app"],
     "contexts": ["blessed_extension"],
     "dependencies": [],
@@ skipping 27 matching lines @@
                 "description": "The failure detail. You may wish to inspect or log this for debugging purposes, but you should not rely on specific strings being passed back."
               }
             ],
             "description": "This function is invoked when inline installation does not successfully complete. Possible reasons for this include the user canceling the dialog, the linked item not being found in the store, or the install being initiated from a non-verified site."
           }
         ]
       }  // install
     ]
   }  // webstore
 ]