Issue 3208 - Improve JSDoc comments

lib/child/contentPolicy.js

Index: lib/child/contentPolicy.js
===================================================================
--- a/lib/child/contentPolicy.js
+++ b/lib/child/contentPolicy.js
@@ -39,22 +39,23 @@ let {Services} = Cu.import("resource://g
 
 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}