Docs: Improve JSDoc for `wp-includes.js/wpdialog.js`.

Props igorsch, LisanneKluitmans, manuelaugustin.
Fixes #43947.


git-svn-id: https://develop.svn.wordpress.org/trunk@43144 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/wpdialog.js

@@ -1,3 +1,6 @@
+/*
+ * Wrap the jQuery UI Dialog open function remove focus from tinyMCE.
+ */
 ( function($) {
 	$.widget('wp.wpdialog', $.ui.dialog, {
 		open: function() {
@@ -8,6 +11,7 @@
 
 			// Open the dialog.
 			this._super();
+
 			// WebKit leaves focus in the TinyMCE editor unless we shift focus.
 			this.element.focus();
 			this._trigger('refresh');