Docs: Improve JSDoc for `zxcvbn-async.js`.

Props manuelaugustin, igorsch, LisanneKluitmans.
Fixes 43948.

Built from https://develop.svn.wordpress.org/trunk@43333


git-svn-id: http://core.svn.wordpress.org/trunk@43161 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/zxcvbn-async.js

@@ -1,4 +1,11 @@
 /* global _zxcvbnSettings */
+/**
+ * Loads zxcvbn asynchronously by inserting an async script tag before the first
+ * script tag on the page.
+ *
+ * This makes sure zxcvbn isn't blocking loading the page as it is a big
+ * library. The source for zxcvbn is read from the _zxcvbnSettings global.
+ */
 (function() {
   var async_load = function() {
     var first, s;

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43332';
+$wp_version = '5.0-alpha-43333';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.