Issue 3208 - Improve JSDoc comments

lib/child/contentPolicy.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 26 matching lines @@
 let {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
 let {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
 
 let {Utils} = require("utils");
 let {getFrames, isPrivate} = require("child/utils");
 let {objectMouseEventHander} = require("objectTabs");
 let {RequestNotifier} = require("child/requestNotifier");
 
 /**
  * Randomly generated class name, to be applied to collapsed nodes.
+ * @type string
  */
 let collapsedClass = null;
 
 /**
  * Maps numerical content type IDs to strings.
- * @type Map
+ * @type Map.<number,string>
  */
 let types = new Map();
 
 /**
  * Checks whether a request should be allowed, hides it if necessary
  * @param wnd {nsIDOMWindow}
  * @param node {nsIDOMElement}
  * @param contentType {String}
  * @param location {String}
  * @return {Boolean} false if the request should be blocked
@@ skipping 284 matching lines @@
         let property = (hasCols ? "cols" : "rows");
         let weights = parentNode[property].split(",");
         weights[index] = "0";
         parentNode[property] = weights.join(",");
       }
     }
     else
       node.classList.add(collapsedClass);
   }
 }