[wrap] Fix doc comment.

lib/utils/wrap.js

@@ -8,12 +8,16 @@ Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
 
-// Node wrapper to ensure ShadowDOM safe operation regardless of polyfill
-// presence or mode. Note that with the introduction of `ShadyDOM.noPatch`,
-// a node wrapper must be used to access ShadowDOM API.
-// This is similar to using `Polymer.dom` but relies exclusively
-// on the presence of the ShadyDOM polyfill rather than requiring the loading
-// of legacy (Polymer.dom) API.
+/* eslint-disable valid-jsdoc */
+/**
+ * Node wrapper to ensure ShadowDOM safe operation regardless of polyfill
+ * presence or mode. Note that with the introduction of `ShadyDOM.noPatch`,
+ * a node wrapper must be used to access ShadowDOM API.
+ * This is similar to using `Polymer.dom` but relies exclusively
+ * on the presence of the ShadyDOM polyfill rather than requiring the loading
+ * of legacy (Polymer.dom) API.
+ * @type {function(Node):Node}
+ */
 export const wrap = (window['ShadyDOM'] && window['ShadyDOM']['noPatch'] && window['ShadyDOM']['wrap']) ?
   window['ShadyDOM']['wrap'] : (n) => n;