Remove instanceType attributes from API documentation

chrome/common/extensions/docs/samples.json

 {
   "api": {
     "chrome.alarms.clear": "alarms.html#method-clear",
     "chrome.alarms.clearAll": "alarms.html#method-clearAll",
     "chrome.alarms.create": "alarms.html#method-create",
     "chrome.alarms.get": "alarms.html#method-get",
     "chrome.alarms.getAll": "alarms.html#method-getAll",
     "chrome.alarms.onAlarm": "alarms.html#event-onAlarm",
     "chrome.app.window.create": "app.window.html#method-create",
     "chrome.app.window.focus": "app.window.html#method-focus",
@@ skipping 1924 matching lines @@
       "path": "examples/api/notifications/",
       "protocols": [],
       "search_string": "NOTIFICATION DEMO SHOWS OFF DESKTOP NOTIFICATIONS, WHICH ARE TOAST WINDOWS THAT POP UP ON THE DESKTOP. BACKGROUND_PAGE NOTIFICATIONS OPTIONS_PAGE TABS",
       "source_files": [
         "background.js",
         "manifest.json",
         "options.html",
         "options.js",
         "style.css"
       ],
-      "source_hash": "a4052b597b547934e7c84ae39627a5378cd2e397",
+      "source_hash": "6a1b18989fb2b403d947c1f879fd0ac086145b8b",
       "zip_path": "examples/api/notifications.zip"
     },
     {
       "api_calls": [
         "chrome.topSites.get"
       ],
       "crx_path": null,
       "description": "extension to prototype new NTP designs",
       "features": [
         "chrome_url_overrides",
@@ skipping 857 matching lines @@
         "manifest.json",
         "popup.html",
         "popup.js",
         "sample.css"
       ],
       "source_hash": "8e51dc3a9577065d22ce92f3c838edc5ceaf4e65",
       "zip_path": "examples/api/extension/isAllowedAccess.zip"
     }
   ]
 }