Shorten _.defer doc comment. [ci skip]

lodash.js

@@ -9264,7 +9264,7 @@
      * _.defer(function(stamp) {
      *   console.log(_.now() - stamp);
      * }, _.now());
-     * // => Logs the number of milliseconds it took for the deferred function to be invoked.
+     * // => Logs the number of milliseconds it took for the deferred invocation.
      */
     function now() {
       return Date.now();