<appview> documentation.

chrome/common/extensions/docs/templates/json/chrome_sidenav.json

 [
   {
     "title": "Devtools",
     "items": [
       {
         "title": "Learn Basics",
         "href": "/devtools",
         "items": [
           {
             "title": "Overview",
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               },
               {
                 "title": "Manifest File Format",
                 "href": "/apps/manifest"
               },
               {
                 "title": "Webview Tag",
                 "href": "/apps/tags/webview"
               },
               {
+                "title": "Appview Tag",
+                "href": "/apps/tags/appview"
+              },
+              {
                 "title": "Web APIs",
                 "href": "/apps/api_other"
               },
               {
                 "title": "Disabled Web Features",
                 "href": "/apps/app_deprecated"
               }
             ]
           },
           {
@@ skipping 547 matching lines @@
                 "title": "Articles",
                 "href": "/webstore/articles"
               }
             ]
           }
         ]
       }
     ]
   }
 ]