Re-generate extension API docs

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 3798 matching lines @@
             }
           },
           {
             "type": "function",
             "name": "callback",
             "parameters": [
               {
                 "name": "state",
                 "type": "string",
                 "enum": ["hidden", "shown", "active"],
-                "description": "'hidden' indicates sidebar is not defined for the specified tab (show was never called or hide() was called). Nothing is displayed for this sidebar.</br>'shown' means sidebar is defined for the specified tab; mini tab is displayed for this sidebar. Sidebar UI is either collapsed or displaying a content of some other extension's sidebar.</br>'active' indicates that sidebar is defined for the specified tab; sidebar UI is expanded and displaying this sidebar's content."
+                "description": "'hidden' indicates sidebar is not defined for the specified tab (show was never called or hide() was called). Nothing is displayed for this sidebar.<br>'shown' means sidebar is defined for the specified tab; mini tab is displayed for this sidebar. Sidebar UI is either collapsed or displaying a content of some other extension's sidebar.<br>'active' indicates that sidebar is defined for the specified tab; sidebar UI is expanded and displaying this sidebar's content."
               }
             ]
           }
         ]
       },
       {
         "name": "setBadgeText",
         "type": "function",
         "description": "Sets sidebar's mini tab badge text for the specified tab.",
         "parameters": [
@@ skipping 535 matching lines @@
                   "token": { "type": "string", "optional": true }
                 }
               }
             ]
           }
         ]
       }
     ]
   }
 ]